Sauces & Condiments
This Argo cornstarch cheese sauce recipe transforms ordinary dishes into creamy, restaurant-quality masterpieces with just three simple ingredients. The secret lies in using cornstarch as a thickener, creating a velvety texture that coats every bite perfectly—no lumps, no breaking, just silky smoothness.
I developed this recipe after struggling with store-bought cheese sauces that always separated or tasted artificial, and this version delivers consistent, foolproof results every time.
The beauty of this sauce lies in its versatility—it works equally well as a pasta topping, dipping sauce for veggies or fries, or even a creamy glaze for baked potatoes.
What sets this recipe apart is the cornstarch's ability to create a sauce that stays perfectly smooth when reheated, unlike traditional flour-based thickeners that can turn grainy. The process is straightforward: melt butter, whisk in cheese and cornstarch mixture, and simmer until thickened, all in just 10 minutes.
What you'll achieve is a cheese sauce so creamy and rich that it elevates even the simplest dishes to gourmet level. The cornstarch ensures a velvety finish without overpowering the natural cheddar flavor, while the slow simmering process prevents any separation.
This sauce keeps beautifully in the refrigerator for up to 5 days or can be frozen for longer storage, making it perfect for meal prep.
For added flavor, consider incorporating garlic powder, onion powder, or fresh herbs like parsley or chives into the sauce base. For dietary adjustments, substitute regular cheese with lactose-free or dairy-free alternatives without compromising texture.
Whether you're covering a plate of mac and cheese or creating a dipping sauce for game day, this recipe delivers professional-quality results at home.
Ingredients for argo cornstarch cheese sauce
Three core ingredients plus seasonings create this ultra-smooth cornstarch cheese sauce.
| Ingredient | Amount | Notes |
|---|---|---|
| Unsalted Butter 🧈 | ½ cup | Cold, cut into small cubes |
| Argo Cornstarch 🌾 | ¼ cup | Lightly toasted for nutty flavor |
| Sharp Cheddar Cheese 🧀 | 2 cups | Shredded, 2-year aged preferred |
| Whole Milk 🥛 | ½ cup | Warmed to room temperature |
| Garlic Powder 🧄 | 1 tsp | Freshly ground preferred |
| Onion Powder 🧅 | ½ tsp | Diamond Crystal preferred |
| Salt 🧂 | ¼ tsp | Diamond Crystal kosher salt |
| Black Pepper 🌶️ | ¼ tsp | Freshly cracked preferred |
The Argo cornstarch is non-negotiable here—it's what creates that signature velvety texture. Grab the fine-ground version from the baking aisle, not the cornmeal. For the cheese, 2-year aged sharp cheddar from a specialty shop delivers the most complex flavor, but Kraft 2% Milk Cheddar works perfectly for everyday use. The butter should be unsalted to control seasoning, and European-style if you want extra richness. Walmart's Great Value brand is surprisingly good for the price, while Land O'Lakes offers consistent quality. Toast the cornstarch lightly in a dry pan for 30 seconds before adding to the sauce—this enhances its nutty notes without burning.
No cornstarch? Arrowroot powder works at a 1:1 ratio, though the texture won't be identical. Running short on cheddar? Gruyère or Monterey Jack blend beautifully—just reduce the milk slightly since these cheeses melt more aggressively. The milk can be half-and-half for extra creaminess, but whole milk ensures proper emulsification. For a dairy-free version, unsweetened almond milk works surprisingly well when combined with nutritional yeast for cheesy depth. The garlic and onion powders are optional but recommended—they add subtle complexity that makes this sauce restaurant-worthy. McCormick's garlic powder is my go-to for consistent flavor, while Simply Organic onion powder delivers a brighter taste.
This sauce reheats beautifully—simmer gently for 2-3 minutes to restore its silky texture. For meal prep, portion into glass jars with a thin layer of butter on top to prevent skin formation. Keeps 5 days refrigerated or 3 months frozen when stored in airtight containers. The cornstarch mixture can be pre-made and stored in the freezer for up to 6 months—just whisk with warm milk when ready to use. For extra smoothness, strain through a fine-mesh sieve before serving, though the sauce should be perfectly lump-free if cooked properly. The sauce thickens as it cools, so add a splash of warm milk if it becomes too stiff when reheated.
Why You'll Love This Recipe
- Five-Ingredient Magic: I swear by this sauce because it’s the kind of recipe where you don’t need a grocery list—just butter, cornstarch, cheese, milk, and a pinch of garlic. That’s it. No fancy techniques, no last-minute store runs. The cornstarch thickens it like a dream, and the sharp cheddar? It melts into something silky without curdling.
- Garlic Butter Bliss: Between us, the garlic powder here isn’t just flavor—it’s the secret weapon. That first bite when the sauce hits your tongue? Warm, nutty, and just a little tangy from the cheddar. It’s the kind of richness that makes you pause mid-bite, even if you’re in a hurry.
- Weeknight & Potluck Hero: I’ve drizzled this over mac and cheese, roasted veggies, and even grilled chicken—it’s that adaptable. And here’s what sold me: it reheats like a champ. Make a double batch on Sunday, and you’ve got Monday’s dinner covered. (Yes, even on a Tuesday night.)
- Budget-Friendly Luxury: Sharp cheddar feels fancy, but it’s actually the affordable star here. A block lasts forever, and the sauce stretches to feed four for under $5. Plus, the cornstarch cuts costs by making every drop of milk work harder. It’s the kind of recipe that makes you feel like you’re treating yourself without breaking the bank.
Step-by-step instructions for Argo cornstarch cheese sauce
This method delivers a velvety, ultra-smooth cheese sauce with perfect thickness every time.
Melt Butter and Toast Cornstarch
In a medium saucepan, melt the 0.5 cup unsalted butter over medium heat. Once fully melted and foaming subsides, reduce heat to low and add the 0.25 cup lightly toasted Argo cornstarch. Stir constantly for 1-2 minutes until the mixture becomes thick and paste-like, resembling a smooth roux.
The key here is patience—don't rush the cornstarch or it will develop a raw flour taste. You'll know it's ready when the mixture holds its shape when you lift the spoon and leaves a glossy sheen on the pan. This step forms the foundation for your sauce's silky texture and prevents lumps later.
Gradually Add Milk and Cheese
Slowly whisk in the 0.5 cup warmed whole milk while maintaining low heat. Add it gradually—about 1 tablespoon at a time—to prevent curdling. Once fully incorporated, remove the pan from heat and immediately stir in the 2 cups shredded sharp cheddar cheese until completely melted and smooth.
This gradual addition prevents temperature shock to the milk, which could cause separation. The cheese should melt into a glossy, homogeneous mixture. If you see any unmelted cheese clumps, strain the sauce through a fine-mesh sieve for an ultra-smooth finish—this is especially important for restaurant-quality results.
Season and Simmer to Perfection
Return the pan to low heat and whisk in the 1 tsp garlic powder, 0.5 tsp onion powder, 0.25 tsp salt, and 0.25 tsp black pepper. Let the sauce simmer gently for 3-5 minutes, stirring constantly, until it reaches your desired consistency. For mac and cheese, aim for a thick, coatable sauce that clings to noodles without being gluey.
Taste and adjust seasoning—this sauce should have a balanced cheddar flavor with subtle garlic and onion notes. If it's too thick, thin with 1 tablespoon warm milk at a time. For extra richness, you can add a splash of heavy cream (not in our ingredient list but works as a variation). The sauce should coat the back of a spoon without being pasty.
Finish and Use Immediately
Once perfectly thickened, remove from heat and cover the saucepan with a lid to maintain heat. This sauce is best used immediately for maximum smoothness, but it will keep in the refrigerator for up to 3 days in an airtight container. When reheating, stir over low heat with 1 tablespoon milk to restore its creamy texture.
For serving over macaroni, toss the hot sauce with freshly cooked noodles and let it sit for 1-2 minutes to fully coat. The sauce should cling beautifully to each strand, creating that signature creamy, cheesy texture we all love. The Argo cornstarch creates a smoother, more stable sauce than flour, with none of the graininess you sometimes get with traditional methods.
Pro Tips For Making Argo Cornstarch Cheese Sauce
- Use a Slotted Spoon for Stirring: You’ll end up with a gluey mess if you don’t—cornstarch sauce loves to clump. A slotted spoon keeps the mixture moving without overworking it, so you get that silky texture instead of a thick, pasty lump.
- Shred Cheese Fine and Warm It First: Cold, uneven shreds turn into cheese clumps in sauce, and no one wants to bite into a cheesy surprise. Grate it fresh, then toss with 1 tablespoon of milk and let it sit for 5 minutes—it melts smoother and faster.
- Low and Slow After the Cornstarch Rush: The moment you add the cornstarch-milk slurry, the sauce will bubble like crazy. Let it cook for 2 full minutes at medium-low heat—this breaks down the starch fully and prevents that raw flour taste.
- Salt the Milk, Not Just the Butter: Sharp cheddar’s already salty, but the milk? Forget it. Add a pinch of salt to the milk before mixing it with cornstarch—it balances the flavor and makes the sauce taste finished, not flat. (Yes, even if your butter is unsalted.)
Serving suggestions for leftovers
Mac & Cheese Masterpiece
This sauce transforms ordinary macaroni into a luxurious dish. Cook 12 ounces elbow macaroni al dente, then toss with the hot cheese sauce. For extra decadence, add ½ cup crispy fried onions on top or mix in ½ cup cooked bacon bits for smoky depth.
The cornstarch thickener ensures the sauce clings perfectly to each noodle without turning gluey. 🧀
Vegetable Dipping Sauce
Serve this sauce warm as a dip for crudités like carrots, celery, and bell pepper strips. The creamy texture pairs beautifully with baked sweet potato fries or pita chips.
For added flavor, stir in 1 teaspoon smoked paprika or ½ teaspoon cayenne pepper before serving. It's perfect for game day or veggie-laden meals.
Baked Potato Topping
Turn baked potatoes into a gourmet meal by spooning this cheese sauce generously over the top. Pair with crumbled bacon, chives, and a sprinkle of sour cream for a restaurant-style loaded potato.
The sauce's smooth texture contrasts beautifully with the potato's fluffy interior. For extra richness, add 2 tablespoons heavy cream to the sauce before serving.
Grilled Cheese Upgrade
Take your grilled cheese sandwiches to the next level by spreading this sauce between layers of sourdough bread with Gruyère cheese. The cornstarch ensures the sauce stays creamy when heated, preventing any soggy bread.
For a twist, add thin apple slices or crispy prosciutto for unexpected flavors. It's a perfect lunch or light dinner option.
Pasta Bar Sauce Station
Set up a pasta bar where guests can customize their own bowls. Offer this cheese sauce as one option alongside marinara and alfredo. Provide toppings like grilled chicken, roasted mushrooms, and sun-dried tomatoes for endless combinations. The sauce's versatility makes it a crowd-pleaser at any gathering.
Breakfast Twist
Use this sauce as a creative breakfast topping for pancakes or waffles. The cheesy flavor pairs surprisingly well with sweet dishes, especially when combined with maple syrup and crispy bacon. For a savory breakfast, drizzle it over scrambled eggs or hash browns for a cheesy, creamy finish.
Nutrition facts
Frequently asked questions
Why does this recipe use cornstarch instead of flour?
Cornstarch creates a smoother, lump-free sauce that reheats beautifully without turning grainy. Unlike flour, it dissolves completely and doesn't develop that floury aftertaste when heated. The Argo brand is especially effective because it's finely ground and light, perfect for achieving that restaurant-quality velvety texture.
Can I make this sauce dairy-free?
Yes! Replace the cheddar with 2 cups dairy-free shredded cheese (like Violife or Daiya) and use unsweetened almond milk instead of whole milk. For extra richness, add 2 tablespoons nutritional yeast when melting the cheese. The cornstarch still works perfectly to create a creamy texture.
What's the best way to fix a sauce that's too thick?
Simply whisk in 1 tablespoon warm milk at a time until you reach your desired consistency. Stir constantly over low heat to prevent lumps. If the sauce separates, whisk vigorously to re-emulsify. The cornstarch mixture helps prevent this, but it can still happen if heated too quickly.
Can I make this sauce ahead of time?
Store it in an airtight container in the fridge for up to 5 days or freeze for 3 months. When reheating, stir over low heat with 1 tablespoon milk to restore creaminess. The cornstarch helps maintain texture better than flour-based sauces. For meal prep, portion into small containers for easy use.
What if my cheese sauce gets grainy?
Graininess usually means the sauce wasn't heated long enough or was stirred too vigorously. Strain through a fine-mesh sieve immediately for an ultra-smooth finish. For future batches, ensure all cheese is fully melted and whisk constantly while simmering. The cornstarch helps prevent this, but proper technique is key.