Peach Cobbler Dump Cake

2 - 16 ounce cans peaches in heavy syrup 1 - 18.25 ounce package yellow cake mix ½ cup butter ½ teaspoon ground cinnamon, or to taste

Preheat oven to 375°F. Empty peaches into the bottom of one 9x13 inch pan. Cover with the dry cake mix and press down firmly. Cut butter into small pieces and place on top of cake mix. Sprinkle top with cinnamon. Bake at 375°F for 45 minutes.