This slow-cooker creamy chicken and mushroom potpie is the ultimate comfort food. Tender chicken and earthy mushrooms are cooked in a rich and creamy sauce, then topped with a flaky puff pastry crust. The slow-cooker method allows the flavors to meld together, resulting in a deliciously satisfying dish. Serve this potpie with a side of mashed potatoes or a green salad for a complete meal.