Preheat oven to 350 degrees. Melt 1/4 cup butter in a 9-inch square pan. Blend in 1/2 cup brown sugar, packed; spread over bottom of pan.

Drain 1 (1 lb.) can sliced peaches and arrange slices in rows on top of butter/sugar mixture. Prepare 1 package of gingerbread mix as directed on box; pour over peach slices. Bake 40-45 minutes. When done, cool a few minutes, then invert cake onto serving plate. Good served warm with whipped topping.