01 -
Preheat oven to 375°F and grease a 9×13-inch baking dish. Combine ground beef, breadcrumbs, eggs, chopped onion, minced garlic, Worcestershire sauce, salt, and pepper in a large bowl. Mix gently until just combined, then press mixture evenly into the bottom of the prepared baking dish.
02 -
In a medium saucepan, melt butter over medium heat. Whisk in flour and cook for 1 minute to eliminate raw flour taste. Gradually add milk while whisking constantly to prevent lumps. Cook until thickened, about 3-5 minutes. Remove from heat and stir in cheese and dry mustard until smooth.
03 -
Spread cooked macaroni evenly over the meatloaf base. Pour the cheese sauce over the pasta, ensuring even coverage. Mix ketchup with brown sugar and spread over the top as a glaze.
04 -
Bake for 35-40 minutes until the meatloaf reaches an internal temperature of 160°F and the cheese sauce is bubbly around the edges. The top should be lightly golden.
05 -
Allow the casserole to cool for 10 minutes before serving. This resting period helps the layers set and makes serving easier while preventing burns from hot cheese sauce.