Grease your slow cooker and add chicken breasts. Season with salt and pepper to your liking
Top chicken with garlic, mushroom slices and marsala wine. Cover and cook for 5-6 hours on low.
Transfer chicken to a plate and set aside. Whisk together water and cornstarch until dissolved, and add it to the sauce that is in the crockpot. Whisk to combine.
Switch the slow cooker to high setting, and add the heavy cream. Whisk again
Transfer chicken back to the slow cooker , cover and cook for another 30 minutes until the sauce has thickened.
Taste and add more salt and pepper if needed. Serve warm topped with fresh parsley. Enjoy!
Notes
- you can substitute marsala win for chicken broth if you are in a pinch.