Combine beef, breadcrumbs, egg, onion, garlic powder, salt, pepper, and ketchup. Mix gently until everything blends well.

Press the meat mixture into a baking dish. Spread it evenly to make a smooth and firm bottom layer.

Place the dish in a hot oven. Bake for twenty minutes until the meatloaf becomes slightly firm and cooked.

Boil water in a large pot. Add macaroni. Cook until soft but firm. Drain and keep aside safely.

Melt butter in a skillet. Add flour. Whisk gently. Slowly add milk and keep stirring until it becomes thick.

Mix in cheddar cheese. Stir well until melted. Add salt and paprika. The sauce should become creamy and smooth.

Pour cooked macaroni into the cheese sauce. Mix until each macaroni piece is covered in thick cheesy sauce.

Remove meatloaf from oven. Spread mac and cheese over the top. Make an even, smooth cheesy layer.

Put the casserole back into the oven. Bake for twenty-five minutes until the top turns lightly golden and bubbly.

Let it rest for five minutes before cutting. This helps the layers hold together perfectly when serving.