4-1/2 cups seasoned croutons 
2 cups (8 ounces) cheddar cheese, shredded 
1 medium onion, chopped 
1/4 cup sweet red pepper, chopped 
1/4 cup green pepper, chopped 
1 jar (4-1/2 ounces) sliced mushrooms, drained 
8 eggs 
4 cups milk 
1 teaspoon salt 
1 teaspoon mustard, ground 
1/8 teaspoon pepper 
8 bacon strips, cooked and crumbled
Sprinkle croutons, cheese, onion, peppers and mushrooms into two greased 8-inch square baking dishes. 
In a bowl, combine the eggs, milk, salt, mustard and pepper. 
Slowly pour over vegetables. 
Sprinkle with bacon. 
Cover and freeze one casserole for up to 3 months. 
Bake the second casserole, uncovered, at 350° for 45-50 minutes or until a knife inserted near the center comes out clean. 
To use frozen casserole: 
Completely thaw in the refrigerator for 24-36 hours. 
Remove from the refrigerator 30 minutes before baking. 
Bake, uncovered, at 350° for 50-60 minutes or until a knife inserted near the center comes out clean. Yield: 2 casseroles (6-8 servings each).