Sauté the onion and bacon until cooked through. Add the diced smoked turkey, bell pepper, potato and seasonings. Stir well to make the filling. Refrigerate for 15 minutes and set aside.
Cut the puff pastry into 4 small pieces, put a layer of filling on each small piece of puff pastry, then roll into a round strip, and then use a fork to compact the left and right sides to seal.
Put the turkey roll in a preheated 200°C oven and bake for 10 minutes, then turn the other side and bake for 5 minutes until golden brown.