1/2 cup (1 stick) melted butter
12 slices of bread, cubed
1 (8 oz.) pkg. cheese, cubed
1 cup diced ham
5 eggs
1 tsp. dry mustard
3 cups milk
1/2 tsp. pepper
1 (4 oz.) can mushrooms, drained (optional)

Melt butter in 9x13-inch pan. Layer 1/2 the bread and 1/2 the cheese. Top with meat and mushrooms, followed by another layer of bread and cheese. Beat eggs, dry mustard, pepper and milk. Pour over bread mixture. Refrigerate overnight.

Bake at 350°F for 1 hour. Let set a while before cutting.