Pre-heat oven to 450 f.
Layout one sheet of defrosted puff pastry onto a parchment lined baking sheet. Cut the dough once half horizontally. Then cut the dough into 1' strips vertically. This should yield approximately 16 strips.
Separate the strips so they do not touch. Place puff pastry strips into the pre-heated oven to bake for 8-10 minutes or until golden brown. Remove and let cool a few minutes.
Place melted butter in one bowl/tray. Combine Sugar and Cinnamon into another.
Roll each churro strip into the melted butter and then roll into the sugar and cinnamon mixture. Repeat until all the strips have been dipped and coated. Plate and enjoy while still warm.