Generously spray a 10-inch bundt pan with non-stick spray.
In a gallon-sized plastic bag, combine sugar, cocoa powder, and cinnamon.
Using kitchen scissors, cut each biscuit in half.
Wrap each candy bar into a biscuit half, like a dumpling. Pinch the seams to make sure that the candy bar is covered by the biscuit dough.
Working in batches of 5 or 6, roll the balls in the plastic bag with the sugar-cocoa-cinnamon mixture, making sure to coat them thoroughly.
Arrange the dough balls in the prepared pan.
In a medium bowl, whisk together the butter and brown sugar.
Drizzle it evenly over the dough balls.
Bake at 325 degrees for 35-40 minutes, or until the edges are golden brown, and when you press toward the center, it should feel 'set' and not doughy. I use the end of a wooden spoon to press lightly toward the center of the bundt to check for doneness. You don't want it to feel doughy toward the middle.
Remove from heat, and cool in pan for 10-15 minutes - no longer, or bread will want to stick to the pan. Run a knife or small rubber spatula along the edges to loosen the bread.
Invert onto a serving platter.
Serve warm. Top with caramel sauce and mini chocolate chips, if desired.
Individual servings reheat easily in the microwave for 20-30 seconds!