In a large bowl, add the drained peaches. Then, toss in the cornstarch, sugars, cinnamon and salt. Mix everything well then pout into the baking pan.
In another bowl, add the cake mix and cold butter. Cut the butter into the cake mix using a pastry cutter or your hands by squeezing the ingredients together. Note, you can also use a food processor because using your hands is very tiring. I also added the grating method below.
Sprinkle the cake mix across the peaches then place in the oven and cook for 45 minutes. When finished, remove from the oven and allow to cool for 20-30 minutes before serving. Enjoy!
Notes
Grating the butter, place the butter in the freezer for 20 minutes then grate it. Spread the butter gratings across the top of the cake mix in the baking pan and it consistently reduces the dry spots.