Macaroni and Cheese

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Grease a 2-quart casserole dish.

Step 2
Place bread crumbs into a small bowl and mix well with melted butter; set aside.

Step 3
Bring a large pot of lightly salted water to a boil. Add macaroni and cook until al dente, 8 to 10 minutes; drain, then place into the prepared casserole dish.

Step 4
While pasta is cooking, melt 2 tablespoons butter in a saucepan over medium heat. Stir in minced onion and cook until onion softens and turns translucent, about 5 minutes.

Step 5
Stir in flour, salt, pepper, and dry mustard until incorporated, then pour in milk and bring to a simmer. Cook, stirring constantly, until milk has thickened, about 10 minutes.

Step 6
Remove from heat and stir in Cheddar cheese until melted. Pour cheese sauce over macaroni, then sprinkle evenly with buttered bread crumbs.

Step 7
Bake in the preheated oven until top is golden and bubbly, about 20 minutes.