Mac and Cheese Recipe for 100 People: Large-Scale Creamy Crowd Pleaser

Feeding a crowd of 100 requires precision, and this creamy mac and cheese delivers restaurant-quality results at scale. I developed this method after catering a family reunion in my tiny Boston kitchen, proving it works in any space.

The secret is cooking the pasta in batches and building the cheese sauce in large stock pots. Using block cheese instead of pre-shredded ensures a smooth, velvety texture without graininess. The key is constant stirring to prevent scorching.

This recipe maintains that perfect balance of creamy sauce and al dente pasta, even when multiplied. The result is a dish that pleases both kids and adults, with a golden breadcrumb topping that adds satisfying crunch.

With careful planning and the right equipment, you’ll serve a crowd-pleasing mac and cheese that tastes homemade. Here’s how to execute it flawlessly.

Ingredients for Mac and Cheese Recipe for 100 People

Large-scale ingredients for a crowd-pleasing creamy mac and cheese that works every time.

The cheese is everything here. Block cheddar and Gruyere from Costco or Sam’s Club keep costs down without sacrificing quality—pre-shredded has anti-caking agents that make the sauce grainy. I always grab extra Parmesan rinds (often free from deli counters) to simmer in the sauce for depth. The pasta? Any short shape works, but elbows are classic. Buy in bulk from restaurant supply stores for the best price on 25 pounds.

No Gruyere? Fontina or Monterey Jack melt just as smoothly. Out of heavy cream? Half-and-half plus a little extra butter gets you close. The Dijon can be swapped for regular mustard (just use a touch less). Need it gluten-free? Rice flour instead of all-purpose and gluten-free pasta. For extra richness, stir in cream cheese at the end—it makes the sauce absurdly velvety.

Make the sauce and pasta separately, then combine just before serving. Leftovers? They’ll keep 3-4 days in the fridge, but the pasta absorbs sauce—add a splash of milk when reheating. For make-ahead, assemble everything except the topping, then bake when ready. The breadcrumb mix can be prepped 2 days ahead and stored at room temp.

Step-by-Step Instructions for Mac and Cheese for 100

Here’s my proven method for creating this creamy crowd-pleaser without the stress.

Step 1: Cook the Elbow Macaroni to Al Dente

Bring a massive stockpot of water to a rolling boil. I salt it generously with 1 cup Salt—it should taste like the sea. Add all 25 lb Elbow Macaroni and stir immediately to prevent sticking.

Cook for 1 minute less than package directions. You want it slightly underdone because it’ll finish cooking in the oven. Test by fishing out a piece—it should have a tiny bite in the center. Drain well and set aside, but don’t rinse or it’ll be too cold when mixed with the sauce.

Step 2: Create the Velvety Cheese Sauce

In a separate large pot, melt all 4 lb Unsalted Butter over medium heat. Whisk in all 3 lb All-Purpose Flour to create a roux. Cook for 2-3 minutes until it turns a light golden color—this removes the raw flour taste.

Gradually whisk in all 10 lb Whole Milk and 5 lb Heavy Cream, ensuring no lumps form. Stir in 1 cup Dijon Mustard, 0.5 cup Garlic Powder, and 0.5 cup Onion Powder. The sauce will thicken as it heats—keep whisking until it coats the back of a spoon.

Step 3: Melt and Incorporate the Cheeses

Reduce heat to low. Add all 30 lb Sharp Cheddar Cheese, 10 lb Gruyere Cheese, and 5 lb Parmesan Cheese in batches, stirring constantly until each addition is fully melted. I’ve found that adding cheese gradually prevents a stringy or grainy texture.

The sauce should be ultra-smooth and creamy. If it seems too thick, add a splash of the pasta cooking water. Taste and adjust seasoning with 0.5 cup Black Pepper—remember, the cheeses are salty, so go easy on additional salt.

Step 4: Combine and Prepare for Baking

Fold the cooked elbow macaroni into the cheese sauce until every piece is coated. I do this in batches to avoid overwhelming the pot. Transfer everything to large baking pans—you’ll need at least two to accommodate this volume.

Spread the mixture evenly in the pans. The pasta should be swimming in sauce, with just a little peeking through at the top. Let it sit for 10 minutes while you preheat the oven to 375°F.

Step 5: Add the Crispy Topping and Bake

Mix all 5 lb Panko Breadcrumbs with 0.25 cup Paprika in a bowl. Sprinkle this evenly over the mac and cheese in the pans. The paprika adds a subtle smokiness and beautiful color.

Bake for 20-25 minutes until the topping is golden brown and the edges are bubbling. Let it rest for 10 minutes before serving—this allows the sauce to set slightly, making it easier to portion. The result should be creamy inside with a crispy, flavorful crust on top.

Dietary Considerations for These Flavors

Gluten-Free Adaptation

Swap Elbow Macaroni for gluten-free pasta like Barilla’s GF elbows. Use rice flour instead of all-purpose for the roux. The sauce will thicken similarly, but stir frequently as GF flours can clump. I test this version often for friends with sensitivities. 💪

Dairy-Free Version

Use vegan butter like Miyoko’s and unsweetened almond milk. For cheese, I recommend Violife Cheddar and Follow Your Heart Parmesan—they melt well. Add 2 tbsp nutritional yeast to deepen the cheesy flavor.

Lower-Fat Option

Replace Heavy Cream with 2% milk and use low-fat cheese. The texture won’t be as rich, but it still satisfies. I’ve served this to health-conscious guests with rave reviews. Stir in 1 cup Greek yogurt at the end for creaminess.

Nut Allergy Note

Check all labels carefully, especially for Parmesan Cheese—some brands use nut-based anti-caking agents. For the topping, ensure Panko Breadcrumbs are nut-free. I always call the manufacturer to confirm. 💡

Vegetarian Confirmation

This recipe is naturally vegetarian as written. The cheeses and dairy provide all the richness. Just verify your Dijon Mustard brand—most are vegetarian, but some contain anchovies.

Lactose-Intolerant Tip

Use lactose-free milk and cheese, like Green Valley Creamery. The sauce will be just as smooth. I’ve made this for lactose-sensitive family members, and they couldn’t tell the difference.

Frequently Asked Questions