Season chicken pieces with salt and pepper and shake in 1/4 cup (60 mL) of the flour to coat. Heat oil in a large skillet over medium-high heat. Sear chicken pieces on both sides; place in slow cooker. In same skillet, add bacon, onion and celery and sauté until bacon begins to brown, about 5 min. Transfer to slow cooker; add carrots and mushrooms.
Whisk together wine, broth, tomato paste, garlic and remaining flour. Stir into skillet and bring to a boil; add to slow cooker. Cover and cook on LOW for 5 hours or until chicken is fully cooked. Serve with sprigs of parsley.