- 1 (29 ounce) can sliced peaches in heavy syrup, undrained
- 1 (18.25 ounce) box yellow cake mix
- 3/4 cup butter, sliced into pats, or more if needed
- Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13-inch baking dish with margarine.
- Pour peaches and heavy syrup into the prepared baking dish. Spread cake mix evenly over peaches. Arrange butter pats in even rows on the cake mix.
- Bake in the preheated oven until top of cake is golden brown, 35 to 40 minutes.