Cheesy Sausage and Potato Breakfast Casserole

By MATTOON250

4.25 / 5

15min

1h 35min

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1 1/2 pounds potatoes peeled
cooking spray
1 (16 ounce) package pork breakfast sausage
1 sweet onion chopped
7 eggs
1 (8 ounce) package Cheddar cheese grated, divided
½ cup milk
salt and ground black pepper to taste