Weekend Biscuit Egg Casserole

buttermilk biscuits (8 count)- (I used open nature biscuits as pictured but have also used Pillsbury Grands Biscuits)

any breakfast sausage roll (browned, drained, and cooled)

shredded mozzarella cheese

shredded cheddar cheese

eggs, beaten

egg whites

milk

salt

black pepper