Preheat the oven to 400 degrees F. Cut out sixteen 5-inch parchment paper squares. Flour a work surface, lay the puff pastry sheets out, and roll the puff pastry sheets to remove the fold lines.
Cut a puff pastry sheet in half. With one half, cut eight even strips. With the other half, cut eight equal squares. Repeat with the second puff pastry sheet.
Dip the squares in the melted butter. Press one side of each square in sugar and lay each square sugar-side-up on its own parchment paper square. Then dip each strip in butter. Press one side of each strip in sugar and roll into a loose spiral. Place a spiral on top of each square.
Lower the parchment paper squares into the wells of a muffin tin. Press each piece down to fill out the wells. Then bake for 20-25 minutes until golden brown.