Slow Cooker Chicken Marsala

If you like garlicky, mushroom awesomeness, this is the recipe for you.
Ingredients --
4 boneless skinless chicken breasts
salt and pepper to taste (I used about ½ teaspoon of each)
2 teaspoons minced garlic
1 cup sliced mushrooms
1 cup sweet marsala cooking wine (may substitute chicken broth in a pinch)
½ cup water
¼ cup cornstarch
fresh parsley, roughly chopped
Directions --
1. Lightly grease your slow cooker with nonstick spray. Season chicken with salt and pepper and place in the bottom of your slow cooker.
2. Top chicken with garlic, mushrooms, and marsala wine. Cover and cook for 5-6 hours on low.
3. Use a slotted spoon to transfer chicken to a plate. Whisk together water and cornstarch until dissolved, and then pour into slow cooker and stir.
4. Add chicken back to slow cooker, switch heat to high, cover and cook another 20-30 minutes until sauce is thickened. Taste and add salt and pepper as needed. Sprinkle with parsley and serve.