Cheese And Onion Casserole

1 cup onions -- minced

1/4 cup shortening

2 cups Cheddar cheese -- grated

1/2 teaspoon salt

1/8 teaspoon pepper

1/2 teaspoon dry mustard

7 slices day old bread

2 tablespoons butter

2 cups milk

Preheat oven to 350?. Saute onions in fat till golden. Add cheese, salt, pepper, mustard; cook, stirring until cheese is melted. Remove from heat. Spread bread slices with butter. In 1 1/2 qt casserole, alternate layers of bread and cheese. Pour on milk. Bake uncovered, 1 hr. Makes 4 servings.