Step 1

Preheat the oven to 375 degrees F (190 degrees C).

Step 2

Spray the 9x13 inch baking dish with cooking spray, or lightly grease with butter.

Step 3

Pour the peaches and syrup into the bottom of the baking dish.

Step 4

Sprinkle the dry cake mix over the peaches, evenly coating from one end to the other and all the way to the sides.

Step 5

Press down firmly on the cake mix to allow it to begin to absorb the peach juices.

Step 6

Slice the butter and cover the top of the cake mix with an even layer.

Step 7

Sprinkle with cinnamon, if using.

Step 8

Bake for 45 minutes, until the juices are bubbling and the top is golden.