3 tbsp. butter
2 1/2 c. uncooked elbow macaroni
1/2 tsp. salt
1/4 tsp. pepper
2 c. cut up mild cheddar cheese (1/2 lb.)
1 qt. milk
1/4 c. diced onion (opt.)
1 tbsp. prepared mustard (opt.)

Melt butter in 8 x 12 inch baking dish. Add uncooked macaroni and stir until well coated. Mix in mustard and/or onion if using. Sprinkle salt and pepper and cheese over top. Pour milk over top. Bake at 325 degrees for 1 hour, uncovered. Stir after 1/2 hour. Top should be browned and milk should all be absorbed, when done.