In a large mixing bowl, stir together the ham, peas, shredded cheddar cheese, cream of mushroom soup, whole milk, sour cream, garlic powder, onion powder, and black pepper until combined well.
1 pound ham, 2 cups frozen peas, 2 cups shredded cheddar cheese, 1 can (10.5 oz) condensed cream of mushroom soup, 1/2 cup whole milk, 1/2 cup sour cream, 1 teaspoon garlic powder, 1 teaspoon onion powder, ½ teaspoon black pepper