Place rutabaga in a Dutch oven with water to cover. Bring water to boil. Reduce heat; simmer, uncovered, 40 minutes or until rutabaga is tender. Drain well; mash.
Combine rutabaga and remaining ingredients, mixing well. Spoon mixture into a lightly greased 2-quart casserole. Bake at 325° for 1 hour or until lightly browned.