Mashed Potatoes with Ham

1/2 cup finely chopped onion
2 tablespoons butter or margarine, divided
3-1/2 to 4 cups hot mashed potatoes (prepared with milk with butter)
1-1/2 cups cubed fully cooked ham
1/4 teaspoon onion salt
1/8 teaspoon pepper
1/2 cup shredded cheddar cheese
1/3 cup crushed cornflakes

In a large microwave-safe bowl, combine onion and 1 tablespoon of butter. Microwave, uncovered, on high for 2 minutes or until tender, stirring once. Add potatoes, ham, onion salt and pepper; mix well.

Transfer to a greased 1-1/2-qt. baking dish. Sprinkle with cheese and cornflakes; dot with remaining butter. Bake, uncovered, at 375° for 15 minutes or until heated through. Makes 4 servings.