In a bowl, combine all ingredients for the marinade. Add in chicken pieces and marinate overnight.
Take chicken out of the marinade and sear in a pan with olive oil. Set aside.
In the same pan, saute onion, garlic, bell pepper, olives, capers, raisins, and bay leaf.
Add in tomato paste and roast briefly.
Deglaze the pan with white wine.
Combine contents of the pan, chicken, potatoes, tomato sauce, and stock in the slow cooker.
Cook for 4 hours on low.
Season to taste with salt and pepper.