Step 1: Cook the Pasta

1. Bring a large pot of salted water to a boil.
2. Add the elbow macaroni and cook according to the package instructions until al dente.
3. Drain the pasta and set it aside.

Step 2: Make the Roux

1. In a medium saucepan, melt the butter over medium heat.
2. Add the flour and whisk continuously for about 1-2 minutes until the mixture becomes golden and bubbly.

Step 3: Prepare the Cheese Sauce

1. Slowly pour in the milk and heavy cream while whisking to avoid lumps.
2. Stir in the Dijon mustard, garlic powder, onion powder, salt, and pepper.
3. Allow the sauce to simmer for 3-4 minutes until it thickens slightly.

Step 4: Add the Cheese

1. Lower the heat and gradually add the white cheddar and mozzarella cheese, stirring constantly until fully melted.

Step 5: Combine and Serve

1. Add the cooked pasta to the cheese sauce and mix until the pasta is well coated.
2. For an extra cheesy touch, sprinkle Parmesan cheese on top and broil for a few minutes until golden.
3. Serve immediately and enjoy!