Dutch Oven Chocolate Cobbler

1 cake mix, mixed according to box directions
Mud:
1/2 cup dry baking cocoa
2 cups brown sugar
4 cups hot water
2 teaspoons vanilla
1 teaspoon cinnamon (optional)
Topping:
1 package chocolate chips
Nuts (optional)
Whipped topping

Line Dutch oven with foil if desired and preheat. Pour the prepared batter into preheated oven. Mix "Mud" ingredients in a separate bowl and pour over the cake batter. Cover the oven (8-10 coals on the lid, 8 coals on the bottom) and bake about 40 minutes. Remove lid about 5 minutes before baking time is up and sprinkle on the chocolate chips to melt for a few minutes. Serve with a scoop of whipped topping