Preheat oven to 375°.
Lightly coat 6 muffin cups with cooking spray.
Pour melted butter into a shallow dish. Combine sugar and cinnamon in another shallow dish.
Unroll dough; separate into breadsticks. Cut each breadstick into 3 equal portions; shape each portion into a ball. Working with one ball at a time, dip into melted butter; gently roll in sugar mixture. Place 6 balls in each muffin cup.
Bake at 375° for 15 minutes. Remove rolls from the pan. Serve warm.