Mini Chicken Pies

Name: Mini Chicken Pies
Prep time: 30 min
Cook time: 1 h 35 min
Total time: 2 h 5 min
Cuisine: American
Ingredients: 17 ½ oz water; 2 tsp chicken stock paste (see Tip); 16 oz chicken thighs, boneless and skinless, cubed (1½ in.); 4 oz yellow onions, halved; 2 sprigs fresh parsley, leaves only; 1 ½ oz salted butter; 1 ½ oz all-purpose flour; 1 ½ oz whole milk; ½ tsp salt; 1 pinch ground black pepper; 5 sheets puff pastry (see Tip); 1 large egg, lightly whisked