Golden Mashed Potatoes Recipe

In a soup kettle or Dutch oven, cook the potatoes and carrots in boiling salted water until tender; drain. Place in a bowl; mash and set aside. In a skillet, saute onions in butter until tender. Add to potato mixture. Add sour cream, salt and pepper; mix until blended. Transfer to a greased 13x9-in. baking dish. Sprinkle with cheese. Bake, uncovered, at 350 ° for 30-40 minutes or until heated through. Freeze option: Cool unbaked casserole; cover and freeze. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Preheat oven to 350 °. Bake casserole as directed, increasing time as necessary to heat through and for a thermometer inserted in center to read 165 °.