Sauces & Condiments
This Argo cornstarch cheese sauce recipe transforms ordinary meals into restaurant-quality dishes with just a few simple ingredients and 10 minutes of hands-on time. The secret lies in the cornstarch slurry—a foolproof technique that creates a velvety, ultra-smooth sauce without lumps or graininess.
I developed this version after years of testing different thickeners, and it consistently delivers the perfect balance of creaminess and flavor.
The beauty of this recipe is its versatility—it works equally well as a pasta topping, broccoli dip, or dipping sauce for fries. The cornstarch slurry (mixed with cold milk) is the game-changer, ensuring a silky texture that clings beautifully to any dish.
I use a blend of sharp cheddar and mild Monterey Jack for depth, but you can customize it with your favorite cheeses. For extra flavor, a pinch of garlic powder and onion powder adds warmth without overpowering.
What sets this sauce apart is how effortlessly it comes together. No fancy equipment or complicated steps—just a saucepan, a whisk, and patience while the mixture thickens. The result? A rich, velvety sauce that’s smooth enough to coat every bite, yet light enough to let the cheese flavors shine.
It reheats beautifully, making it perfect for meal prep or last-minute dinners.
Once you try this ultra-smooth stovetop magic, you’ll never go back to store-bought versions. The sauce keeps well in the fridge for up to 5 days, so you can make a big batch and enjoy it all week.
Whether you’re covering spaghetti, smothering veggies, or turning grilled chicken into a gourmet meal, this cheese sauce will elevate everything it touches.
Ingredients for argo cornstarch cheese sauce
Nine ingredients transform into velvety, restaurant-quality sauce with just cornstarch magic.
| Ingredient | Amount | Notes |
|---|---|---|
| Argo Cornstarch 🌾 | 2 tbsp | For ultra-smooth texture |
| Unsalted Butter 🧈 | 4 tbsp | Cold, cubed for even melting |
| Whole Milk 🥛 | 2 cups | Cold for slurry consistency |
| Sharp Cheddar Cheese 🧀 | 1 ½ cups | Freshly grated, block preferred |
| Monterey Jack Cheese 🧀 | ½ cup | Freshly grated for creaminess |
| Garlic Powder 🧄 | ½ tsp | For subtle depth of flavor |
| Onion Powder 🧅 | ½ tsp | Balances garlic without sharpness |
| Kosher Salt 🧂 | ½ tsp | Diamond Crystal preferred |
| Ground Black Pepper 🌶️ | ¼ tsp | Freshly cracked for warmth |
| Heavy Whipping Cream 🥛 | ½ cup | Full-fat for richness |
The Argo cornstarch is non-negotiable here—it's the secret weapon for that ultra-smooth texture. Grab the fine-ground version at Whole Foods or Wegmans if you can, but the regular grocery store stuff works fine. For the cheeses, block cheddar and Monterey Jack are key—pre-shredded gets clumpy and lacks flavor. I always buy Kraft Natural cheddar blocks because they grate perfectly. The milk needs to be cold—whole milk works best, but 2% in a pinch. Pro tip: measure your cornstarch and milk precisely, then whisk like you mean it for that perfect slurry.
No Argo cornstarch? Instant clear cornstarch at half the amount works, but the texture won't be quite as silky. Substituting butter? Olive oil or vegan butter changes the flavor profile slightly but keeps it creamy. For the cheeses, Gruyère or Gouda add delicious variations—just reduce total cheese to 1.5 cups. Want more depth? Add a pinch of smoked paprika. The garlic and onion powders are flexible—fresh minced garlic at half the amount gives a brighter flavor, but the powders are more convenient. And if you're watching fat, reduce the cream to 1/4 cup—it'll still be rich, just lighter.
This sauce reheats beautifully—just add a splash of milk if it thickens too much. Keeps 5 days in the fridge, 3 months frozen. For freezing, portion into ice cube trays, then transfer to a bag. Thaws in minutes! The cornstarch slurry trick means no lumps, even after reheating. I always make double batches—one for pasta, one for dipping fries. The leftovers taste even better the next day as the flavors meld. Store in airtight containers with parchment between layers to prevent sticking.
Why You'll Love This Recipe
- I swear by this trick: just melt butter, whisk in cornstarch, then add milk and cheese. The sauce thickens instantly—no lumps, no stress, just creamy perfection. My lazy nights just got a major upgrade.
- No-Fuss Magic Sauce: I swear by this trick: just melt butter, whisk in cornstarch, then add milk and cheese. The sauce thickens instantly—no lumps, no stress, just creamy perfection. My lazy nights just got a major upgrade.
- Sharp & Silky: That cheddar-jack combo? Chef’s kiss. The sharp chedddar cuts through the richness while Monterey Jack keeps it velvety smooth. Honestly, I’ve tried store-bought sauces, but this one actually tastes homemade.
- Weeknight Workhorse: Drizzle it over tacos, pasta, or roasted veggies—it’s my secret weapon for quick dinners. Even my picky husband asks for seconds, and that’s saying something.
Step-by-step instructions for Argo cornstarch cheese sauce
Here's how to create the velvety, ultra-smooth cheese sauce you've been craving.
Create the Cornstarch Slurry
In a small bowl, whisk together the 2 tbsp Argo Cornstarch with ½ cup of the whole milk until completely dissolved. This creates your thickening agent, and I promise you, using cold milk here makes all the difference. The cornstarch needs to be fully incorporated—no lumps—so whisk vigorously for about 30 seconds. Set this mixture aside while you prepare the butter and remaining milk.
The reason we use cold milk for the slurry is simple: cold milk absorbs the cornstarch more evenly, preventing those dreaded lumps that can ruin an otherwise perfect sauce. Think of this as your secret weapon for that restaurant-quality texture.
Melt the Butter and Warm the Milk
In a medium saucepan set over medium heat, melt the 4 tbsp unsalted butter until it's fully liquid but not browned. Add the remaining 1½ cups cold whole milk and bring to a gentle simmer. You'll know you're on the right track when you see small bubbles forming around the edges but not a full rolling boil.
This is where patience pays off. Let the mixture simmer gently for about 5 minutes, stirring occasionally with a wooden spoon. The butter should be completely melted and the milk should be hot but not scalding. If you see any butterfat separating, gently stir to re-emulsify it—this ensures a smooth sauce from the start.
Thicken the Sauce Gradually
Slowly pour the cornstarch slurry into the simmering milk mixture while whisking constantly. This gradual addition prevents lumps from forming. Once fully incorporated, reduce the heat to low and continue stirring for about 3-4 minutes until the sauce begins to thicken noticeably. You're looking for a consistency that coats the back of a spoon but isn't gluey yet.
Here's the thing—if the sauce thickens too quickly, simply add 1-2 tablespoons of hot milk to loosen it. The goal is a smooth, velvety texture that's neither too thin nor too thick. I've found that maintaining a gentle simmer is key to avoiding any graininess that can sometimes happen with cornstarch-based sauces.
Add the Cheeses and Seasonings
Reduce the heat to lowest and begin adding the cheeses. First, stir in the 1.5 cups freshly grated sharp cheddar cheese in small batches, allowing each addition to melt completely before adding more. Follow with the ½ cup freshly grated Monterey Jack cheese, stirring constantly to ensure even melting. The sauce should be smooth and glossy at this point.
Next, whisk in the 0.5 tsp garlic powder, 0.5 tsp onion powder, 0.5 tsp kosher salt, and 0.25 tsp freshly cracked black pepper. Taste and adjust seasoning if needed—this is your chance to perfect the flavor balance. The sauce should be rich and savory, with a subtle depth from the garlic and onion powders. If it tastes too mild, add a pinch more salt or a dash of pepper.
Finish with Cream and Test Consistency
Remove the saucepan from heat and stir in the 0.5 cup heavy whipping cream. This final addition elevates the sauce to a luxurious texture. If the sauce is still too thick, thin it with 1-2 tablespoons of hot milk until it reaches your desired consistency. For mac and cheese, I like it slightly thicker so it clings beautifully to the pasta.
Give the sauce one final taste and adjust seasoning if necessary. The sauce should be silky smooth, with a perfect balance of cheesy richness and subtle seasoning. If you're serving it immediately, transfer it to a serving dish. For best results, keep it warm over low heat while serving—this cheese sauce only gets better with a little extra warmth.
Pro Tips For Making Argo Cornstarch Cheese Sauce
- Melt Cheese Slowly: After butter and milk are simmering, add the cheeses one at a time—start with the Monterey Jack first, then the sharp cheddar. I learned this the hard way: dumping both in together means the cheddar won’t melt smoothly and can turn grainy. Give each cheese 30 seconds to incorporate before adding the next.
- Whisk Like You Mean It: When mixing the cornstarch slurry, don’t just stir—whisk aggressively for 30 seconds before adding it to the pot. I used to half-ass this step, and the sauce would clump or taste starchy. A proper whisk creates tiny bubbles that help the sauce thicken evenly and stay silky.
- Keep Heat Moderate: Once the sauce starts thickening, drop the heat to medium-low and walk away for 2 minutes. I used to babysit the pot, and the sauce would either scorch or split. Let it cook undisturbed—it’s the only way to get that velvety consistency without lumps or a burnt bottom.
- Shred Cheese Fine: Use a box grater or food processor for the cheeses—no big chunks. I was skeptical until I tried it: pre-shredded cheese has anti-caking agents that make the sauce grainy. Freshly shredded melts like a dream and gives you that restaurant-quality smoothness. (Yes, even if it takes 5 minutes.)
Essential equipment for this recipe
Essential Saucepan
You’ll need a medium-sized, heavy-bottomed saucepan—I use my All-Clad Stainless Steel 3-quart pan—to prevent scorching and ensure even heat distribution. The saucepan should have sloped sides to help with whisking and prevent spills when adding the cornstarch slurry.
Avoid nonstick pans for this recipe, as the high heat can degrade the coating and affect flavor. A 3- to 4-quart pan works perfectly for this recipe’s yield. 🔥
Whisk for Smoothness
A balloon whisk or French whisk is non-negotiable for this recipe—it creates the tiny air bubbles that give the sauce its signature velvety texture. I prefer a stainless steel whisk with angled wires because it cuts through the cheese more effectively.
Avoid plastic or silicone whisks, as they can’t handle the heat and won’t create the same smooth finish. A long-handled whisk also makes stirring easier without splashing. 💫
Measuring Tools
Precision matters here! Use a liquid measuring cup for the milk and a dry measuring spoon set for the cornstarch and spices. I swear by my OXO Good Grips measuring spoons—they’re durable and easy to read.
For the cheeses, a box grater with fine holes (like the Microplane) ensures even grating without clumping. A kitchen scale isn’t required but helps if you’re experimenting with cheese ratios. 📏
Heat Source
Your stovetop should be gas or induction for the most consistent heat control. Gas burners let you adjust the flame precisely, while induction cooktops respond instantly to temperature changes. If you have an electric coil, opt for a medium-low setting and stir frequently to avoid hot spots.
Avoid halogen burners—they can cause uneven heating and potential scorching. A kitchen timer (even your phone works) helps track the 5-minute simmer without guessing. ⏱️
Storage Containers
For leftovers, transfer the sauce to airtight glass containers—I love Pyrex 8-cup storage bowls with snap-on lids. Glass preserves flavor better than plastic and reheats evenly. If freezing, use quart-sized freezer bags with squeeze-out valves to remove excess air and prevent freezer burn.
Label containers with the date to track freshness. For serving, a small ceramic dish keeps the sauce warm and adds a restaurant touch. ❄️
Nutrition facts
Frequently asked questions
Why does this recipe use cornstarch instead of flour?
Cornstarch creates a smoother, glossier finish without altering the cheese flavor like flour can. It thickens at lower temperatures and doesn't leave that floury aftertaste. The cold milk slurry also prevents lumps better than flour mixtures. For a restaurant-quality texture, cornstarch is the secret weapon!
Can I make this sauce without dairy?
Yes! Swap the butter for olive oil, use unsweetened almond milk instead of whole milk, and replace cheeses with 1.5 cups dairy-free cheddar (like Violife) or nutritional yeast for a cheesy flavor. The cornstarch slurry method still works perfectly. The texture will be slightly lighter but still velvety.
What if my sauce gets too thick?
Simply whisk in 1-2 tablespoons of hot milk to loosen it. Keep the pan on low heat while stirring until it reaches your desired consistency. The sauce should coat the back of a spoon but still flow smoothly. If it's too thick after adding milk, let it simmer for another minute—it'll thicken back up slightly.
How do I prevent cheese from clumping?
Always grate your own cheese (block cheddar works best) and add it in small batches while stirring constantly over low heat. The cornstarch slurry helps too—it creates a smoother base for the cheese to melt into. If you see clumps, strain the sauce through a fine-mesh sieve before serving. Pre-shredded cheese contains anti-caking agents that cause clumping.
Can I use this sauce for mac and cheese?
This sauce is perfect for mac and cheese—it's rich enough to coat pasta beautifully. For best results, cook your pasta al dente, drain well, then toss with the sauce. The cornstarch thickening ensures it clings perfectly without being gluey. Add a splash of milk if needed to reach your ideal consistency for pasta.