Heat the milk and cream together to a boil. Melt butter in saucepan. When melted, add all the flour stirring constantly. Let cook for 4-5 minutes, continuing to stir. Remove from heat and add warm milk and cream while whisking -- if sauce is too thick, add a touch more milk.

Add cheese to white sauce and stir. (Save a bit of cheese for the topping.) Stir sauce into macaroni and place in a buttered casserole dish. Top with remaining cheeses. Place in 350° F oven until slightly brown and bubbly on top, about 25-30 minutes.