1. Preheat the oven to 425 degrees Fahrenheit. Line a baking sheet with parchment paper.
2. Season the salmon generously with salt and pepper. Season the garlic mash with salt.
3. Place the puff pastry squares on a lined baking sheet. Place one salmon fillet on a diagonal across a puff pastry square. Spread a little garlic over top of the salmon. Pull up the two corners on the long sides of the salmon, pinch together, and turn slightly to create a twist shape. Continue with the remaining salmon and pastry.
4. Brush the pastry with egg wash and until the puff pastry is golden and salmon is fully cooked.