01 - Preheat the oven to 400°F. Line two baking sheets with parchment paper for easy cleanup and to prevent sticking.
02 - Combine granulated sugar and ground cinnamon in a small bowl, stirring until evenly blended.
03 - Roll out thawed puff pastry sheets on a lightly floured surface. Brush each sheet generously with melted butter, then sprinkle the cinnamon sugar mixture evenly across the surface.
04 - Using a pizza cutter or sharp knife, slice each pastry sheet into 4 long strips approximately 1 1/2 inches wide.
05 - Twist each strip several times to create texture. Form into bunny silhouettes by shaping an oval body and looping one end for the head, pinching dough to secure shape. Create small ear shapes from remaining dough if desired.
06 - Transfer shaped bunnies to prepared baking sheets, leaving adequate space between each for expansion during baking.
07 - Whisk together the egg and milk in a small bowl until thoroughly combined.
08 - Lightly brush each bunny twist with the egg wash mixture. Gently press chocolate chips or raisins into the dough for eyes if decorating.
09 - Bake for 13-15 minutes until the pastry is puffed, golden brown, and cooked through. The twists should feel firm and lightly crisp.
10 - Remove from oven and allow to cool on the baking sheets for 5 minutes. Dust generously with powdered sugar just before serving for a festive finish.