Jerry's 3M Casserole (Mom’s Milk and Mushroom)

1. Brown sausage and onion together in a large skillet over medium heat; drain. Stir in the butter while onions and sausage are hot.
2. Arrange the potato slices in a deep cooking dish or cast iron pan or Dutch oven.
3. Cover the potatoes with the pkg. of shredded mozzarella cheese; pour the sausage, onion, and butter mixture over the cheese and potatoes; sprinkle lightly with ground cayenne pepper.
4. Mix together the can of cream of mushroom soup with one cup of whole milk and small can of evaporated milk; pour this mixture into the pot over the other ingredients. If needed, add additional milk to almost cover the contents of the pan.
5. Sprinkle with salt and black pepper.
6. Bake, uncovered at 350 degrees for 2 hours or until the potatoes are tender.
7. Remove from oven and cover with the shredded cheddar cheese. Serve while hot or re-heat before serving. Serves 6 to 8.