01 -
Lightly grease a 5.7-liter slow cooker with cooking spray and set aside.
02 -
Evenly season chicken breasts with garlic powder, dried basil, thyme, paprika, salt, and pepper on all sides.
03 -
Heat olive oil in a skillet over medium-high heat. Sear chicken breasts for 3 minutes per side until golden brown. Transfer to the slow cooker and top with sliced mushrooms and minced garlic.
04 -
Return the skillet to medium-high heat and add marsala wine. Cook for 1 minute, scraping up browned bits from the bottom. Pour the wine over the chicken and mushrooms.
05 -
Cover and cook on LOW for 4 to 5 hours or HIGH for 2 to 3 hours until the chicken reaches an internal temperature of 74°C.
06 -
Whisk together water and cornstarch until smooth. Stir the slurry into the wine sauce in the slow cooker, then add heavy cream and combine.
07 -
Return the chicken to the slow cooker, cover, and cook on HIGH for 20 minutes or until the sauce thickens. Adjust seasoning and add more cream for desired consistency.
08 -
Plate the chicken, spoon the creamy mushroom Marsala sauce over it, garnish with fresh parsley if desired, and serve.