In another large mixing bowl, stir together 2 ¼ cups baking mix, ¼ cup sugar, melted butter, and milk. Drop bits of dough on top of the fruit mixture.
In a small mixing bowl, stir together remaining ¼ cup sugar and ground cinnamon. Sprinkle cinnamon sugar on top of the dough.
Bake for 45-55 minutes, or until the topping has puffed and the fruit is bubbling. Cool for 5-10 minutes before serving.
Serve warm with whipped cream or ice cream on top.