01 - Preheat oven to 400°F. Line two baking sheets with parchment paper.
02 - Combine granulated sugar and ground cinnamon in a small bowl. Mix until thoroughly incorporated.
03 - Roll out thawed puff pastry sheets on lightly floured surface. Brush each sheet generously with melted butter, then sprinkle cinnamon sugar mixture evenly across surface.
04 - Using 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. Form bunny silhouette by creating oval body shape and looping remaining end to form head. Pinch dough firmly to secure shape. Form small ear shapes from dough scraps if desired.
06 - Transfer formed bunny twists to prepared baking sheets, spacing at least 2 inches apart to allow for expansion during baking.
07 - Whisk together egg and milk in small bowl until smooth. Lightly brush each twist with egg wash using pastry brush.
08 - Press mini chocolate chips or raisins into dough to create eyes if using decorations.
09 - Bake for 13-15 minutes until twists are puffed, golden brown, and fully cooked through.
10 - Remove from oven and let cool on baking sheets for 5 minutes. Dust generously with powdered sugar before serving warm or at room temperature.