Combine the baking mix, 1/2 cup sugar, ground cinnamon and milk. Spray a 9 x 13 baking dish with cooking spray and spread the mixture in bottom of the dish. Drop drained peach slices on top
Combine the other 1/2 cup sugar, the saved 1 cup peach juice and the stick of butter in a bowl and microwave about 2 minutes or until butter is melted and sugar is dissolved. (You could do this on stove as well)
Pour this over the peaches in the baking dish.DO NOT STIR. Place in preheated 350 degree oven for 45 minutes. Makes about 8 servings.