Cook the Pasta:

Cook the macaroni according to the package instructions until al dente. Drain and set aside.

Make the Cheese Sauce:

In a large saucepan, melt the butter over medium heat. Stir in the flour and cook for 1 minute to make a roux. Gradually whisk in the milk and heavy cream to avoid lumps. Stir in the Dijon mustard, garlic powder, onion powder, salt, and pepper. Let the mixture simmer for 3–5 minutes until it thickens slightly.

Add the Cheese:

Lower the heat and gradually add the cheddar, mozzarella, and parmesan cheeses to the sauce. Stir until the cheese has melted and the sauce is smooth.

Combine Pasta and Sauce:

Toss the cooked pasta into the cheese sauce and stir until the pasta is evenly coated with the creamy mixture.

Prepare for Baking:

Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish and pour the cheesy pasta mixture into it. For a crispy topping, sprinkle breadcrumbs evenly over the top and dot with small pieces of butter.

Bake:

Bake for 20–25 minutes or until the top is golden and bubbling. For an extra crispy top, broil for 2–3 minutes, keeping an eye on it to prevent burning.