Joanna Gaines' Chicken Potpie Recipe

Ingredients

• Nonstick cooking spray, for the pan
• 4 tablespoons (1/2 stick) salted butter
• 1/4 small white onion, finely chopped (optional)
• 4 carrots, peeled and cut into 1/2-inch dice
• 1/4 cup all-purpose flour
• 8 cups (64 ounces) chicken broth, store-bought or homemade
• Two 22.6-ounce cans condensed cream of chicken soup
• 4 cups shredded meat from 1 store-bought rotisserie chicken
• 1 cup frozen peas
• Kosher salt and freshly ground black pepper
• Two 8-ounce tubes refrigerated crescent rolls
• Mashed potatoes, for serving