INGREDIENTS
2 tbsp
butter
1/4 cup
finely chopped onion
2 tbsp
all-purpose flour
2 cups
milk
3/4 tsp
salt
1/2 tsp
dry mustard
1/4 tsp
ground black pepper
1 8 ounce package
elbow macaroni
2 cups
shredded sharp Cheddar cheese
1 8 ounce package
processed American cheese, cut into strips