Croissant Breakfast Casserole

Croissant Breakfast Casserole was pinched from <a href="http://www.food.com/recipe/croissant-breakfast-casserole-71017" target="_blank">www.food.com.</a>
INGREDIENTS
4 plain croissants
1 tablespoon butter
2 cups sliced fresh mushrooms
1/4 cup sliced green onion
4 eggs
1 cup milk
1 cup shredded swiss cheese
1 cup shredded mozzarella cheese
1/4 cup parmesan cheese
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