Stir in the corn, condensed chicken soup, ¼ cup of the shredded cheese, milk, sour cream, garlic powder, salt, and pepper. Remove the pan from the heat.
1 can (15.25 ounces) corn, drained, 2/3 cup condensed cream of chicken soup, 1/2 cup shredded cheddar cheese, 1/2 cup whole milk, 2 Tablespoons sour cream, 1 teaspoon garlic powder, 1/2 teaspoon salt, 1/4 teaspoon ground black pepper