Preheat the oven to 400 degrees Fahrenheit and thaw the puff pastry.
Roll out the pastry and cut it into 12 triangles.
Fill the triangles with your filling and then roll them up into a croissant by folding in the wide "base" of the triangle to the point. Curve the rolls into a horseshoe shape and place on a greased baking sheet.
Bake for 15 minutes until golden brown. Remove from oven and brush with butter. Enjoy!