1 box yellow cake mix
1-2 sticks butter, cut into 1/8 to 1/4" pats (the butter needs to completely cover the top of the cake mix)
Preheat oven to 375*
Empty peaches into the bottom of 9x13 pan or a casserole dish.
Sprinkle cake mix evenly over top of peaches.
Lay pats of butter down, if you use a 9x13 you may need more than 1 stick.
Sprinkle with cinnamon and bake for 45 minutes.
Recipe from: http://www.sixsistersstuff.com/2012/05/peach-cobbler-dump-cake-recipe.html
Some melt their butter first and then pour it on, I haven't tried that yet. You can see where there weren't butter pats the cake mix didn't cook right so you have to make sure it's covered.