- Preheat the oven to 375 degrees. 
- Drain one of the cans of peaches, reserving the syrup. Empty the peaches into a lightly greased 13 x 9 - inch baking pan. Empty the entire contents of the second can of peaches - including the syrup - into the pan. Spread the peaches out evenly across the bottom of the pan. Sprinkle the cinnamon sugar mixture over the top of the peaches. 
- Sprinkle the cake mix on top of the peaches trying to make sure to evenly cover the peaches. 
- Cut the butter into thin slices - about a dozen or so - and arrange them across the top of the dry cake mix. Pour the reserved peach syrup over the top of the butter & cake mix. Sprinkle everything with the brown sugar. 
- Bake in the preheated oven for 45 - 55 minutes or until the crust is no longer soft & has become golden brown. Remove from the oven & allow to cool slightly before glazing.