Preheat oven to 400 deg. F. Remove one puff pastry sheet from freezer, and allow to thaw at room temp. for 30 to 40 minutes.
Roll piece of puff pastry out to a 14"x10" rectangle. Using a 3-1/2" heart shaped cookie cutter (or any shape you would like), cut out 12 hearts from sheet of pastry (*or as many as you can with the shape you are using)
Place puff pastry hearts on a baking sheet(s). Brush Dulce de Leche sauce evenly over each heart.
Crush heath bars and sprinkle hearts with crushed candy bits.
Bake at 400 deg. F. for 10 minutes until puffed. Remove from oven and allow to cool to room temp.
If desired, place chocolate in a microwave safe cup or bowl, and microwave for about 1-1/2 minutes (stirring every 30 seconds) until melted and smooth.
Drizzle chocolate over each heart cookie.