Sprinkle remaining flour onto work surface. Add dough; knead until mixture forms smooth ball. Use rolling pin to roll dough into 12x10-inch rectangle. Melt remaining butter; brush 1 Tbsp. onto dough. Mix remaining sugar and cinnamon. Reserve 1 Tbsp.; sprinkle remaining over dough. Top with chocolate; press gently into dough. Roll up dough tightly, starting at one long side.