Cheesy Corn Muffins Recipe

In a small skillet, saute onion in butter until tender; set aside. Prepare muffin mixes according to package directions; fold in the onion. Fill greased or paper-lined muffin cups two-thirds full. Combine sour cream and cheese; drop by rounded teaspoonfuls onto each muffin. Bake at 400 ° for 15-20 minutes or until muffins test done. Cool in pan for 5 minutes before removing to a wire rack.