In a mixing bowl, whisk together the soup, sour cream, onion powder, garlic powder, salt, and pepper. Pour over the potatoes and stir together. Stir in 1 ½ cup shredded cheese.
1 10.5 oz can condensed cream of chicken soup, 1 cup sour cream, 1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon salt, ½ teaspoon ground black pepper, 2 cups shredded cheddar cheese