Chicken Pot Pie

Name: Chicken Pot Pie
Prep time: 30 min
Total time: 30 min
Cuisine: American, Southern
Ingredients: 375 g plain flour, plus more for surface; 225 g butter, cut into 1.5 cm pieces; 1 tsp. baking powder; 1 tsp. salt; 120 mL ice water (or more, if needed); 4 boneless skinless chicken breasts; 110 g butter, plus more for baking dish; salt; Freshly ground black pepper; 2 large carrots, peeled and diced; 1 medium onion, chopped; 3 cloves garlic, crushed; 95 g plain flour; 720 mL low-sodium chicken stock; 60 mL double cream; 150 g frozen peas; 2 tbsp. freshly chopped parsley; 2 tsp. freshly chopped thyme leaves; Egg wash; Flaky sea salt