Preheat oven to 350 degrees F.
Heat milk in a large saucepan over medium heat to almost boiling.
Reduce heat to low and gradually add cheeses, stirring constantly for about 5 minutes until all cheese is melted.
Place cooked macaroni in a 4 quart casserole dish or individual ovenproof dishes. Pour cheese sauce over pasta and stir until well blended. Top with bread crumbs.
Bake for 50-60 minutes or until browned and bubbly.