Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
Scramble the eggs in a skillet, seasoning with salt and pepper, until just set; let cool slightly.
Roll out the puff pastry and cut into squares.
Spoon the scrambled eggs, cheese, and any optional fillings onto each square.
Fold or wrap the pastry around the filling and seal the edges.
Brush with the egg wash.
Bake for 18-20 minutes, until golden brown and puffed.