thaw puff pastry on counter for about 45 minutes, or in fridge overnight
preheat oven to 400 degrees
make instant mashed potatoes according to package directions
into 2 cups of the instant mashed potatoes, mix in the french fried onions, stirring gently to combine
lay out the puff pastry on a parchment lined cookie sheet and roll out to a rectangle shape (or as close as you can get)
cut into 12 even pieces
plop about 1 tablespoon potato mixture into the center and then form into a little package by bringing opposite corners together and pinching the seams to close
repeat with all the squares, and the then second piece of puff pastry
spread out evenly on parchment lined baking sheet
bake at 400 degrees until golden brown and puffed, about 20-25 minutes.
enjoy!
Notes
if you don't have a rolling pin, you can shape the puff pastry with your hands or a clean can, bottle, etc.