Mac and Cheese

2 cups elbow macaroni
2 tbsp butter
2 tbsp flour
1/2 tsp fresh ground pepper
2 cups milk
2 1/2 cups shredded lower-fat sharp or old cheddar cheese
1/2 cup grated low fat parmesan

Cook the macaroni for 7 minutes.
Drain and return to pot.
Melt butter in a large saucepan at medium heat.
Whisk in flour and add pepper.
Whisk in milk gradually and stir constantly until it just comes to a boil.
Remove pan from heat and add cheese.
Stir constantly, until the cheeses melt, and it becomes smooth.
Add cooked macaroni and toss.