Fast-as-Boxed Macaroni and Cheese

8 oz. dried small elbow macaroni (about 2 cups)
1 1/2 cups 1% milk
1 T all-purpose flour
1 t. Dijon mustard
1/2 t. garlic powder
1 1/2 cups shredded cheddar cheese
2 T grated Parmesan cheese

1) Cook the pasta according to package directions. Drain and set aside.
2) Return the saucepan to the stove but do not place over heat just yet. Add the milk, flour, mustard, and garlic powder and whisk until well blended.
3) Place over medium-high heat and bring to a simmer, stirring constantly. Reduce the heat and continue to simmer and stir gently until the mixture thickens slightly, about 2 minutes.
4) Add the cheeses adn stir until all the cheese melts. Stir in the pasta, heat through and serve.

Serves 4.