Directions: In large kettle, bring to boil 3 quarts water with 1 tablespoon salt. Start heating oven to 400F. Grease 1 1/2 quart casserole. Drop macaroni into boiling water; boil, uncovered, stirring often with fork, about 9 minutes. Meanwhile, mince onion (about 4 teaspoons); put in saucepan over low heat with 2 tablespoons butter. When butter is melted, stir in flour, mustard, salt, pepper. Slowly stir in milk; cook until smooth and hot, stirring often. Slice about 3/4 of cheese right into sauce; stir until cheese is melted. When macaroni is done, drain into colander; turn into casserole. Pour cheese sauce over macaroni, add remaining cheese in cubes, tossing lightly with fork so that all macaroni gets nicely coated. Dot top with remaining butter and sprinkle bread crumbs on top. Bake uncovered, 20-30 minutes. |