Place potatoes in a saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or until tender. Drain and place in a large bowl; mash the potatoes. Add the remaining ingredients; mix well.
Transfer to a greased 8-in. square baking dish. Bake, uncovered, at 350° for 30-35 minutes or until lightly browned.
TEST KITCHEN TIP Instead of baking the mashed potatoes in the oven, you can spoon them into a slow cooker keep them warm on low.