While the chicken is frying, pour the stock into the slow cooker and stir in the mustard ... in the cream and cornflour mixture, cover and cook for a further 10 minutes or until the sauce thickens.
Mushrooms, spinach, and thin chicken breasts in a cream sauce is the ultimate comfort food. Chicken Florentine is one of those dishes that has been around for a long time, and for good reason.
The bread rolls are perfect for soaking up any extra sauce left on ... of the chicken broth and mustard. Whisk together the remaining ¼ cup of chicken broth and sour cream. Set aside.