Add 2 tbsp of butter to a skillet and sauté 1/2 an onion until softened to it. Add peas and carrots and sprinkle flour over the pot
Raise heat to medium and add chicken broth. Add chicken to pan and cook until sauce is thick, continuously stirring the mixture. Season with salt and pepper
Place pastry square on baking sheet and spoon mixture into the center. Then wet the edges with your finger to seal
Brush the tops of each pocket with melted butter and score the edges