Table of Contents
Make mac and cheese for 20 people using 5 lbs pasta, 3 lbs cheese, 3 quarts milk, 2 cups butter, 2 cups flour, and seasonings.
Always shred your own cheese because pre-shredded creates grainy sauce.
Cook pasta al dente then make a roux with butter and flour.
Add warm milk gradually to prevent lumps.
Melt cheese slowly on low heat and never boil the sauce.
Combine pasta and sauce then pour into buttered pans.
Top with buttered breadcrumbs and bake at 375°F for 20-30 minutes until golden.
Hold finished dish above 140°F in oven, chafing dish, or crockpot.
Add proteins like bacon or vegetables like broccoli for variations.
Use gluten-free pasta or dairy-free substitutes for dietary restrictions.
Question | Answer |
|---|---|
How much cheese do I need for 20 people? | You need 3 lbs shredded cheese. |
Can I use pre-shredded cheese? | No, pre-shredded makes grainy sauce. |
What temperature should I bake at? | Bake at 375°F for 20-30 minutes. |
How do I keep it warm for serving? | Hold above 140°F in oven, chafing dish, or crockpot. |
Can I make this ahead of time? | Yes, refrigerate up to 3 days. |
List ingredients for a 20-person batch
Easy mac and cheese recipe for a crowd needs simple ingredients scaled big. This 20-person batch uses basic pantry items and feeds everyone generously.
Core ingredients
Item | Amount | Note |
|---|---|---|
Elbow macaroni | 5 lbs dry | Cook al dente |
Sharp cheddar cheese | 3 lbs shredded | Fresh shred only |
Whole milk | 3 quarts | Warm before use |
Butter | 2 cups (4 sticks) | Unsalted |
All-purpose flour | 2 cups | For roux |
Salt | 4 tbsp | Adjust to taste |
Black pepper | 2 tbsp | Fresh ground |
Mustard powder | 2 tbsp | Enhances cheese flavor |
Breadcrumbs | 3 cups | For crispy topping |
Melted butter | 1/2 cup | Mix with breadcrumbs |
Cheese blend options
Mix cheeses for deeper flavor. Keep total at 3 lbs.
- 2 lbs sharp cheddar + 1 lb Gruyère = nutty depth
- 2 lbs cheddar + 1 lb pepper Jack = spicy kick
- 1 lb cheddar + 1 lb mozzarella + 1 lb Parmesan = extra stretch
- All cheddar = budget-friendly crowd pleaser
Equipment needed
Big batch needs big tools.
- 20-quart stock pot for pasta
- Large saucepan or Dutch oven for sauce
- Two full-size hotel pans (12x20") OR three 9x13" baking dishes
- Aluminum foil for covering
- Large mixing spoons
Cook pasta and prepare cheese sauce
Cook pasta al dente
Fill 20-quart pot with 10 gallons water. Bring to rolling boil. Add 1 cup salt. Pour 5 lbs elbow macaroni. Stir immediately. Cook 2 minutes less than package directions. Drain in colander. Rinse with cold water. Toss with 2 tbsp oil. Set aside.
Make cheese sauce base
Melt 2 cups butter in large Dutch oven over medium heat. Whisk in 2 cups flour. Cook 2 minutes while stirring constantly. Slowly pour 3 quarts warm milk while whisking vigorously. Bring to gentle simmer. Cook 5 minutes until sauce coats spoon. Reduce heat to low.
Melt cheese properly
Add 3 lbs shredded cheese one handful at a time. Stir until completely melted before adding more. Sprinkle in 2 tbsp mustard powder, 2 tbsp black pepper, 4 tbsp salt. Stir until smooth. Keep warm on lowest setting.
Step | Time | Heat Level |
|---|---|---|
Boil pasta | 8-10 min | High |
Make roux | 2 min | Medium |
Thicken sauce | 5 min | Medium |
Melt cheese | 8-10 min | Low |
Work simultaneously. Start sauce while pasta water heats. Use warm milk to prevent lumps. Stir cheese sauce constantly to avoid scorching.
Combine and bake for crispy topping
Mix pasta and sauce
Dump drained pasta directly into hot cheese sauce pot. Toss with large spoon until every noodle coated completely. Work quickly while sauce stays hot and fluid. Mixture looks loose and creamy. If too thick splash warm milk 1/2 cup at a time until coats noodles easily. Finish mixing in under 3 minutes to prevent cooling.
Transfer to baking pans
Spoon mixture into buttered pans. Use two full-size hotel pans (12x20") or three 9x13" glass dishes. Spread evenly with spatula. Fill pans only 3/4 full to prevent boil-over. Tap pans hard on counter three times to settle contents and release air bubbles. This stops soggy spots.
Add crispy topping
Stir 3 cups breadcrumbs with 1/2 cup melted butter until crumbs look like wet sand. Sprinkle mixture evenly across both pans. Add extra cheese on top if desired. Cover pan edges with foil strips to protect from over-browning. Press topping gently into surface so it sticks.
Bake and finish
Slide pans into preheated 375°F oven. Bake uncovered 25-30 minutes for hotel pans, 20-25 minutes for 9x13" dishes. Look for bubbling edges and deep golden crust. Internal temperature must reach 165°F for food safety. Rotate pans halfway through for even browning.
Pan Type | Bake Time | Servings | Notes |
|---|---|---|---|
Two hotel pans (12x20") | 25-30 min | 20 | Even heating |
Three 9x13" dishes | 20-25 min | 20 | Cool faster |
Topping variations
- Crushed Ritz crackers + butter
- Panko + melted butter + Parmesan
- Crushed potato chips (no butter needed)
- Extra cheese only (no crumbs)
Rest pans on wire rack 10 minutes before cutting. Sauce sets and thickens as it cools. Cover loosely with foil if holding longer than 15 minutes.
Keep warm and serve in portions
Hold at safe temperature
Keep mac and cheese above 140°F. Choose your method.
Method | Temp | Duration | Setup |
|---|---|---|---|
Oven hold | 200°F | 2 hours | Loose foil cover |
Chafing dish | Low flame | 3-4 hours | Water in base |
Crockpot | Warm setting | 4 hours | Stir every 30 min |
Insulated carrier | N/A | 90 min | Preheat with hot water |
Stir every 15 minutes during holding. Add warm milk 1/4 cup at a time if edges dry. Place parchment paper on surface before covering to prevent skin.
Portion and serve efficiently
Pre-cut portions before guests arrive. Use clean spatula. Cut 3x4 inch squares for hotel pans or 4x4 inch squares for 9x13" dishes. One square feeds one adult.
- Hotel pan: 24 portions
- 9x13" pan: 12 portions
- Buffet: Serve from chafing dish with spoon
- Plated: Portion in kitchen, cover with foil
- Self-serve: Leave knife in pan
Warm plates in 200°F oven for 5 minutes. Hot plates keep food warm longer.
Reheating cold batches
Refrigerate within 2 hours. Cool uncovered 20 minutes first. Cover tightly. Store 3 days max.
Reheat single portions in microwave 90 seconds with splash of milk. Reheat whole pans covered in 350°F oven 20-25 minutes. Add 1 cup milk before reheating. Stir halfway.
For outdoor events use insulated carriers. Preheat carrier with hot water first. Dry and load hot pans. Seal tightly. Bring extra milk in thermos for touch-ups.
Try popular variations and add-ins
Protein add-ins
Add protein to make it a main dish. Stir in cooked proteins after combining pasta and sauce.
- Bacon: 2 lbs cooked crisp, crumbled
- Ham: 3 lbs diced, browned
- Chicken: 4 lbs shredded rotisserie
- Lobster: 3 lbs cooked meat, chopped
Vegetable add-ins
Steam or roast veggies first. Add during mixing step.
- Broccoli: 3 lbs florets, steamed
- Jalapeños: 2 cups sliced, seeded
- Tomatoes: 4 cups halved, roasted
- Spinach: 2 lbs fresh, wilted
Cheese variations
Replace up to 1 lb of cheddar with these.
Cheese | Amount | Flavor |
|---|---|---|
Gruyère | 1 lb | Nutty |
Pepper Jack | 1 lb | Spicy |
Smoked Gouda | 1 lb | Smoky |
Brie | 1 lb | Creamy |
Spice it up
Add these to sauce while melting cheese.
- Cayenne: 1 tsp for mild heat
- Hot sauce: 1/4 cup (Frank's RedHot)
- Chili powder: 2 tbsp
- Old Bay: 2 tbsp (great with seafood)
Dietary swaps
Make it work for everyone.
- Gluten-free: Use GF pasta and rice flour for roux
- Dairy-free: Use plant milk, vegan butter, and vegan cheese
- Low-fat: Use 2% milk, reduce cheese by 1 lb
Mix add-ins evenly. Use large tongs or two spoons. Work fast to keep everything hot. Taste and adjust seasoning before baking. Add-ins dilute salt and spice.