2 cups potatoes, cubed 2 cups cooked ham, cubed 1 (15.25 ounce) can whole kernel corn, drained 1/4 cup finely minced fresh parsley 1/4 cup butter | 1 tablespoon chopped onions 1/3 cup all-purpose flour 1 3/4 cups milk 1/8 teaspoon ground black pepper 4 ounces processed cheese food, shredded |