- Slice chicken breasts in half lengthwise. Set aside. 
- Grease slow cooker and add garlic and oil. 
- Season chicken with salt and pepper on each side and lay in crock pot. 
- Pour wine over chicken and cover crock pot. 
- Cook on high 3 hours or low 7. 
- Mix water with arrowroot and stir until absorbed, no lumps. 
- Remove chicken from crock pot and keep warm. 
- Stir in arrowroot water mixture into the bottom of the crock pot and add mushrooms. 
- Add back the chicken and stir to coat chicken with sauce and mushrooms, 
- Cover and cook an additional hour. 
- Serve with a sprinkle of chopped fresh parsley.