Slow Cooker Chicken Marsala Ingredients 4-5 ea. chicken breasts 1 jar Mushroom Marsala Cooking sauce For garnish (optional) 1/8 cup Italian parsley; chopped Directions Place chicken breasts and Mushroom Marsala sauce in a slow cooker and set to low. Cook for 6 hours. Serve with pasta or potatoes. Garnish with parsley. It can't get easier or tastier-seriously!