Mac and Cheese

2 c. elbow macaroni
2 T butter
2 T flour
2 c. milk
4 c. shredded cheddar cheese
1/2 c. greek yogurt or sour cream
salt and pepper to taste

Boil macaroni in salted water for about 10 minutes. Meanwhile, melt butter in small saucepan. Once hot and bubbly, stir in flour to make a roux. Stir in milk and wait for it to get a little thick, then add cheese. Stir until melted. I used mostly cheddar and some mozzarella. You can use all cheddar if you have it. Reserve some to sprinkle on top. Stir in greek yogurt. Season with salt and pepper. Stir sauce into pasta after you drain it. Pour it into a dish and bake for about 20 minutes on 400 degrees.