Ingredients

Instructions

  1. Preheat oven at 350°F.
  2. Cook macaroni according to package directions; drain.
  3. For cheese sauce, in a saucepan melt butter. Cook onion in butter till tender but not brown.
  4. Stir in the flour, salt, and pepper.
  5. Add milk all at once; cook and stir till thickened and bubbly.
  6. Cook and stir 1 to 2 minutes more.
  7. Add cubed cheese; stir till melted.
  8. Stir macaroni into cheese cause. Turn into a 1 1/2 quart casserole. Arrange tomato slices atop macaroni; sprinkle with a little salt. Bake in a 350°F oven 30 to 45 minutes or until heated through.