Fresh Peach Upside-Down Cake
["1/4 c. margarine", "4 to 5 large peaches or 8 to 9 small peaches, peeled and sliced", "1 c. packed brown sugar"]
["Melt margarine in 9 x 13-inch pan. Spread sugar evenly over bottom and arrange on top of sugar. Prepare yellow or white cake mix per directions. Pour over peaches in pan. Bake at 350\u00b0 for 45 minutes."]
["margarine", "peaches", "brown sugar"]