Preparing the Cheese Sauce

Make a roux. In a heavy saucepan over medium heat, melt 3 Tbsp unsalted butter. Sprinkle 3 Tbsp all‑purpose flour over the butter and whisk continuously for 2‑3 minutes until the mixture turns a light golden hue. This cooks out the raw flour flavor and creates the thickening backbone of the sauce.
Add liquid. Slowly whisk in 2 cups whole milk, ensuring no lumps form. Continue whisking until the mixture thickens, about 5‑6 minutes. The sauce should coat the back of a spoon and have a velvety texture.
Incorporate cheeses. Reduce heat to low and stir in 4 oz cream cheese until smooth. Then add 1 ½ cups shredded sharp cheddar and 1 cup shredded mozzarella, allowing each addition to melt completely before adding the next.
Season. Sprinkle in 1 tsp garlic powder, ½ tsp smoked paprika, and a pinch of salt and pepper. Taste and adjust—if you crave extra heat, stir in a tablespoon more buffalo sauce.
Combine. Fold the cooked macaroni and buffalo‑coated chicken into the cheese sauce, mixing until everything is evenly coated. Transfer the mixture to a greased 9‑x 13‑inch baking dish, spreading it into an even layer.

Baking & Finishing

In a small bowl, combine ¾ cup panko breadcrumbs with 2 Tbsp melted butter until the crumbs are lightly coated. Sprinkle the breadcrumb mixture evenly over the top of the casserole. Bake in a pre‑heated 375°F (190°C) oven for 20‑25 minutes, or until the surface is golden brown and the sauce bubbles at the edges. Let the dish rest for 5 minutes before serving to allow the sauce to set.

Tips & Tricks

Perfecting the Recipe

Al Dente Pasta. Cook the macaroni just shy of fully done; it will finish cooking in the oven, preventing a mushy texture.

Even Sauce Distribution. Stir the cheese sauce gently but thoroughly to avoid pockets of dry pasta or chicken.

Breadcrumb Crunch. Toast the panko lightly in a dry skillet before mixing with butter for extra crunch.

Flavor Enhancements

Finish the casserole with a drizzle of ranch or blue‑cheese dressing for added tang, or stir in a handful of chopped green onions just before serving for a fresh bite.

Common Mistakes to Avoid

Avoid over‑cooking the sauce; once it thickens, remove from heat to keep it smooth. Also, don’t skip the resting time—cutting too early releases all the sauce onto the plate.

Pro Tips

Use a Sharp Cheddar. A high‑quality sharp cheddar gives a deeper flavor and better melt compared to mild varieties.

Pre‑Season the Chicken. Toss the chicken with a pinch of salt before adding buffalo sauce; it helps the meat retain moisture.

Cool the Sauce Slightly. Let the sauce sit for a minute after thickening; this prevents it from separating when mixed with hot pasta.

Variations

Ingredient Swaps

Swap chicken for shredded pork tenderloin or diced cooked sausage for a different protein profile. Use pepper jack cheese instead of mozzarella for extra heat, or add roasted red peppers for a sweet, smoky note. If you prefer a lighter sauce, replace half the milk with low‑fat chicken broth.