Directions

1. Preheat oven to 350°F. In a medium bowl combine brown sugar and cornstarch. Add grape juice, stirring until sugar dissolves. Set aside.
2. Coat a 9x13-inch baking dish with nonstick cooking spray. Place grapes, blueberries and blackberries in baking dish; pour brown sugar mixture over top. Set aside.
3. In a large bowl whisk together eggs, oil and 1 cup water. Add cake mix, muffin mix and cinnamon; whisk to combine. Pour evenly over fruit.
4. Place baking dish in oven. Bake 30 to 35 minutes or until a wooden toothpick inserted into the center comes out clean. Remove from oven; let cool on a wire rack 20 minutes. Serve warm.