Preheat the oven to 350 degrees and line a baking tray with wax paper. In a small bowl, beat the egg
Sprinkle flour on a clean surface where you will be working
Fold out the puff pastry sheet and cut into even 4” pieces
Using a teaspoon, scoop the Nutella or your filling choice in the center of the pastry sheet
Brush some of the egg mixture around the edges of the pastry sheet
Fold the sheet over and crimp down with a fork so that it is properly sealed. Place it on the baking sheet. Repeat the process until all the puff pastry is filled
Lightly brush some more egg mixture over the pockets. Sprinkle with powdered sugar
Place on the middle rack of the oven and bake until golden brown, about 25 minutes. Take out and let cool