Unroll 1 can crescent dough onto work surface; pat into 13x9-inch rectangle, pressing perforations and seams together to seal. Brush with 1 Tbsp. of the remaining butter; sprinkle with reserved cinnamon mixture and 1/3 cup chocolate chips. Roll up, starting at one short end; cut into 6 slices. Place, cut sides up, in half the prepared baking dish.