Line the bottom of an 8"X8" cake or brownie pan with buttered wax or parchment paper. Sprinkle evenly with brown sugar (optional).
Pour entire contents of 1 can peaches into the pan.
Drain syrup from the second can and add only the fruit to the pan.
Evenly spread yellow cake mix (dry/powder form) over peaches.
Melt the butter and pour onto the peaches and cake mix.
Bake for 40 minutes or until golden brown.
Note: If not fully brown, broil on high (under top-only heat) for about 5 minutes to make a crispy top. Watch carefully while broiling!
Serve with vanilla ice cream.