Cornbread Chicken Pot Pie

Name: Cornbread Chicken Pot Pie
Ingredients: 2 tablespoons extra-virgin olive oil; 1 large onion, chopped; 3 garlic cloves, finely chopped; 3 large carrots, cut into chunks; 1 baking potato, peeled and cut into chunks; Kosher salt; Freshly ground black pepper; 1/4 all-purpose flour; 3 cups chicken stock or low-sodium broth; 2 cups shredded rotisserie chicken; 1 1/4 cups cornmeal; 1/3 cup all-purpose flour; 1/4 teaspoon baking powder; 1/4 teaspoon baking soda; 1 large egg; 1 cups well-shaken buttermilk