Spread bread cubes evenly in a greased 8x 1 1/2-inch round baking pan.
In a medium bowl beat together eggs, milk, and yogurt.
Stir in Monterey Jack cheese, cheddar cheese, and green pepper.
Pour the egg mixture over bread cubes in baking pan.
Cover and refrigerate for 2 to 24 hours.
Uncover pan before cooking.