Preheat the Oven
Preheat the oven to 375°F (190°C). Lightly grease a 12-cup muffin tin with cooking spray or butter.
Make the Cinnamon Sugar
In a small bowl, combine the granulated sugar and ground cinnamon. Mix until evenly combined. Stir the vanilla extract into the melted butter.
Prepare the Dough
Place the crescent roll dough on a lightly floured surface. If using perforated crescent dough, gently press the seams together.
Roll Out the Dough
Gently roll the dough into a larger rectangle. Avoid overworking the dough.
Add Butter and Cinnamon Sugar
Brush the surface generously with the melted butter. Sprinkle an even layer of cinnamon sugar over the entire surface.
Roll Into a Log
Starting from one long edge, tightly roll the dough into a log. Pinch the seam closed.
Cut the Dough
Using a sharp knife, cut the log lengthwise down the center. Cut the resulting pieces into portions that will fit into the muffin cups.
Shape the Cruffins
Gently twist each dough portion and place it into a greased muffin cup with the layered side facing upward.
Bake
Bake for 18–22 minutes, or until the cruffins are puffed and golden brown.
Finish
Allow the cruffins to cool for several minutes. If desired, brush the tops with a little melted butter and sprinkle with additional cinnamon sugar or powdered sugar.