Macaroni

1/4 c. chopped onion
1 T. butter
1 T. flour
pinch of pepper
1 1/4 c. milk
8 oz. Velveeta cheese (grated or shredded)
2 tomatoes, sliced (optional)
2 c. uncooked elbow macaroni

Cook macaroni according to package directions. Cook onion in butter until tender and clear. Stir in flour, pepper and milk. Stir until slightly thickens. Add cheese and stir until completely melted. Mix macaroni and sauce together and pour in 9x9 dish. Bake at 350 for 25-30 minutes. Sprinkle tomatoes on top and bake for a little longer.