Cheeseburger Casserole

Preheat the oven to 350°.

Spread butter on both sides of the bread. Cut slices in half and set aside. Brown the ground beef. Add onion, celery, prepared mustard and 1/2 teaspoon of salt.

In a buttered 9 x 9 x 2-inch baking dish, place alternate layers of toast, beef mixture and cheese.

In a small bowl, beat the egg, then stir in the milk, dry mustard and the remaining salt.

Pour mixture over the cheese. Sprinkle with paprika and bake, uncovered, for 25 minutes.