Chicken, ham and mushroom crusty puff pies

Name: Chicken, ham and mushroom crusty puff pies
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: European, British
Ingredients: 150g button mushrooms; 25g butter; 4 skinless cooked chicken breast; 100g lean ham; 350g fresh cheese sauce; 100g frozen peas; 1 tbsp chopped fresh parsley; 300g puff pastry; 1 tbsp plain flour; Tbsp milk; Salt and pepper