Classic Chicken Pot Pie

Name: Classic Chicken Pot Pie
Prep time: 30 min
Total time: 30 min
Cuisine: American, Southern
Ingredients: 3 c. (360 g.) all-purpose flour, plus more for surface; 1 c. (2 sticks) unsalted butter, cut into 1/2" pieces; 1 tsp. baking powder; 1 tsp. kosher salt; 1/2 c. (1 stick) unsalted butter, plus more for dish; 1 medium yellow onion, finely chopped; 2 large carrots, peeled, finely chopped; Kosher salt; 3 cloves garlic, finely chopped; 1/2 c. (60 g.) all-purpose flour, plus more for surface; 3 c. low-sodium chicken broth; 1/4 c. heavy cream; 4 (8-oz.) boneless, skinless chicken breasts, poached, cut into cubes; 1 c. frozen peas; 2 tbsp. chopped fresh parsley; 2 tsp. chopped fresh thyme leaves; Freshly ground black pepper; 1 large egg, lightly beaten; Flaky sea salt