01 - Preheat oven to 400°F. Line two baking sheets with parchment paper.
02 - Combine granulated sugar and ground cinnamon in a small bowl, mixing thoroughly until evenly incorporated.
03 - Roll out 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 measuring approximately 1 1/2 inches wide.
05 - Twist individual strip several times to create texture. Form oval shape for body, looping remaining end to create bunny head. Pinch dough firmly to secure shape. Form small ear pieces from remaining dough if desired.
06 - Arrange formed bunny twists on prepared baking sheets, leaving adequate space between each piece for expansion during baking.
07 - Whisk egg with milk in small bowl until combined. Brush each pastry twist lightly with egg wash using pastry brush.
08 - Press mini chocolate chips or raisins into pastry to create eyes, ensuring they adhere to egg wash surface.
09 - Bake for 13-15 minutes until pastry achieves golden brown color and has puffed significantly. Monitor closely to prevent over-browning.
10 - Remove from oven and allow twists to cool on baking sheet for 5 minutes. Dust generously with powdered sugar before serving warm or at room temperature.