I can never resist potatoes when they’re made like this!

Butter for greasing
4 cups thinly sliced potatoes
1 thinly sliced onion
1 1/2 cups diced cooked ham
1 cup shredded cheddar cheese
1 can cream of mushroom soup
1/2 cup milk
1/2 cup sour cream
1/4 teaspoon garlic powder
1/2 teaspoon paprika
Salt and pepper to taste
Chopped fresh parsley for garnish