Eggs, Bell Pepper, & Sausage Casserole

1 pound sausage, cooked and drained
12 eggs
3 cups milk
1 teaspoon salt
1/4 teaspoon pepper
6 slices bread, cut into pieces
2 cups cheddar cheese, shredded
1/4 cup green (bell) pepper, diced
1/2 cup onions, diced

Preheat oven to 350° degrees F.