Ingredients - 2 pound ground beef - 1 medium yellow onion, diced - 2 (10.5 oz) cans cream of mushroom soup - 1 cup milk - 1/2 teaspoon garlic powder - 1/2 teaspoon kosher salt - 1/2 teaspoon ground black pepper - 4 medium russet potatoes, peeled and sliced thinly (about 1/8'') - 1/2 cup shr