Guess I am a lazy cook but the first thought I had was " another item to wash up, the food processor". But when I made that recipe I just cut the butter into a lot of small pieces and distribute across the cake mix.
Now I am trying to stay away from "processed" foods like cake mixes and just make cobblers from scratch. An old recipe/method is to melt a stick of butter in bottom of 9x13 pan, just put butter in pan and place in oven as you preheat it to 350. Take pan out as soon as butter is melted, mix 1 cup self rising flour, 1 cup milk, 3/4 cup sugar together in a bowl, and pour over melted butter. DO NOT STIR. Spoon cut up peaches over top of batter distributing evenly, DO NOT MIX OR STIR. Place in preheated oven for about 30-40 minutes. Remove when golden brown and delicious. Perfect plain or with a scoop of ice cream. Sometimes i add about 1 tsp of almond extract to the batter. It adds just a hint of "what is that" flavor to the cobbler.