In the slow cooker, combine the browned ground beef, drained corn, cream soup, sour cream, shredded cheese, diced onion, garlic powder, salt, and pepper. Stir everything together until well mixed.
1 pound ground beef, 1 can (15 ounces) corn, 1 can (10.5 ounces) cream of mushroom soup, ½ cup sour cream, 1½ cups shredded cheddar cheese, 1 small onion, 1 teaspoon garlic powder, Salt and pepper