Mac and Cheese Recipe No Roux: Ultra Creamy With Zero Lump Risk

I’ve discovered the secret to ultra-creamy mac and cheese without the fuss of a roux. This method eliminates the risk of lumps while delivering a velvety, rich sauce every time.

The trick lies in using a simple cornstarch slurry or evaporated milk to thicken the cheese sauce naturally. No whisking, no constant stirring—just smooth, consistent results with minimal effort.

What you get is a dish that’s just as satisfying as the classic, with a sauce that clings perfectly to every elbow. The texture is impossibly smooth, and the flavor is pure comfort.

Serve it as a side or a main—this version proves you don’t need a roux for restaurant-quality mac and cheese.

Ingredients for Mac and Cheese Recipe No Roux

A handful of pantry staples and a couple cheeses create this velvety, lump-free dish effortlessly.

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The cheese is non-negotiable here. Cabot or Tillamook sharp cheddar melts beautifully without turning stringy. For Gruyère, Whole Foods or Trader Joe’s have good options at a reasonable price. Always buy blocks and shred yourself—pre-shredded has anti-caking agents that make the sauce grainy. Evaporated milk is the secret weapon; Carnation is the most reliable brand in my experience.

No evaporated milk? Heavy cream at half the amount works in a pinch (though it’s richer). Swap Gruyère for fontina or Monterey Jack—both melt like a dream. Cornstarch is key for that silky texture, but arrowroot powder at the same ratio does the trick too. For a tangier kick, add 1 tsp of dry mustard along with the Dijon. Skip the nutmeg if you’re not a fan (I always forget it anyway).

Leftovers keep in the fridge for up to 4 days. Reheat gently with a splash of milk to loosen the sauce. Freezes beautifully for 3 months—just undercook the pasta a touch before freezing. I always double the batch and stash half away (future me is always grateful).

Step-by-Step Instructions for Mac and Cheese No Roux

Here’s the method I’ve perfected for silky, lump-free cheese sauce without a roux.

Step 1: Cook the Elbow Macaroni to Al Dente

Bring a large pot of salted water to a rolling boil. I add the 12 oz Elbow Macaroni and cook it for exactly 1 minute less than the package states for al dente. You want it slightly underdone because it will continue cooking when you add it to the hot sauce.

Stir occasionally to prevent sticking, and taste test at the 8-minute mark—it should have a slight bite at the center. Drain immediately in a colander, but don’t rinse. The starch on the pasta surface will help thicken the sauce later.

Step 2: Create the Cornstarch Slurry

In a small bowl, whisk together the 2 tbsp Cornstarch with the 0.5 cup Whole Milk until completely smooth. This slurry is your secret weapon for a velvety sauce without making a roux. Make sure there are no lumps—this ensures the sauce thickens evenly.

I always use cold milk for this step because it prevents the cornstarch from clumping. Set this mixture aside while you prepare the cheese base. The cornstarch will activate when heated, creating that perfect creamy consistency we’re after.

Step 3: Build the Cheese Base

In a large saucepan over medium heat, melt the 3 tbsp Unsalted Butter. Once melted, add the 1 can Evaporated Milk, 1 tsp Dijon Mustard, 0.5 tsp Garlic Powder, 0.5 tsp Onion Powder, 1 tsp Salt, 0.5 tsp Black Pepper, and 0.25 tsp Ground Nutmeg. Stir well to combine.

Let this mixture come to a gentle simmer—you’ll see tiny bubbles forming at the edges. This is when you’ll add your cornstarch slurry. The mustard and spices will bloom in the warm liquid, infusing the sauce with depth of flavor.

Step 4: Thicken and Add Cheese

Slowly pour the cornstarch slurry into the saucepan while whisking constantly. Continue whisking for 1-2 minutes until the mixture thickens noticeably—it should coat the back of a spoon. This is your cue that the sauce base is ready for the cheese.

Reduce the heat to low and add the 8 oz Sharp Cheddar Cheese and 4 oz Gruyère Cheese gradually, about 1 cup at a time, whisking until each addition is fully melted before adding more. This gradual addition prevents the sauce from breaking or becoming grainy.

Step 5: Combine and Serve

Add the cooked elbow macaroni to the sauce and stir until every piece is coated in the creamy cheese mixture. If the sauce seems too thick, add a splash of the pasta cooking water to loosen it to your desired consistency.

Let it sit for 2-3 minutes off the heat—the sauce will thicken slightly as it cools. The pasta will absorb some of the sauce, creating that perfect cling we all love. Serve immediately while hot, as the sauce will continue to thicken as it stands.

Troubleshooting This Recipe

Sauce Too Thin

If your sauce isn’t thickening, the cornstarch may not have activated. Bring it to a gentle boil for 1-2 minutes while whisking constantly. If still thin, mix 1 tbsp cornstarch with 1 tbsp cold water and whisk into the sauce. Simmer for another 2 minutes. 💡

Sauce Too Thick

If the sauce becomes gluey, stir in ¼ cup whole milk or reserved pasta water, 1 tbsp at a time, until it reaches your desired consistency. Heat gently to avoid breaking the emulsion. I always keep some pasta water on hand for this exact purpose.

Grainy Cheese Sauce

Graininess usually means the cheese wasn’t melted properly. Remove from heat immediately and whisk vigorously. If that fails, add 1 tbsp lemon juice—the acid helps re-emulsify the fats. Always shred your own cheese; pre-shredded contains anti-caking agents that cause this issue.

Sauce Separating

If the sauce splits, you likely added the cheese too quickly or overheated it. Remove from heat and whisk in 1 tsp Dijon mustard or 1 tbsp cold evaporated milk. This often brings it back together. Next time, add cheese more gradually and keep heat at low.

Lumpy Cornstarch

Lumps in your slurry mean it wasn’t fully dissolved. Strain the mixture through a fine-mesh sieve before adding to the sauce. Alternatively, use arrowroot powder which dissolves more easily. I’ve found Bob’s Red Mill brand works best for both. ⚡

Pasta Sticking

If your noodles clump, you may have overcooked them or let them sit too long after draining. Rinse briefly with warm water if needed, but don’t overdo it—you want some starch for sauce adhesion. Cook pasta 1 minute less than package instructions to prevent this.

Frequently Asked Questions