| In a large pot with boiling salted water, cook macaroni until al dente; drain. In a medium saucepan, over medium heat melt butter or margarine. Whisk flour and stir vigorously. Add milk and cook until thick and bubbly, about 5-7 minutes. Add cheeses and stir until completely melted. In a large bowl mix together the drained pasta and cheese sauce mixture. Toss to coat evenly. Pour into a greased 2-quart casserole dish and cover. Bake in a preheated 350°F oven for 30 minutes. Let stand 10 minutes before serving. | 
