Brown bell pepper, onion, mushrooms and garlic in oil in skillet. Place whole chicken in crockpot; add seasonings and vegetables, topping with vegetables from skillet. Add wine. Cook until done.
Remove chicken to warmed platter (in 200-degree oven). Add water to cornstarch and salt and stir to a paste, then add to crockpot mixture and cook until slightly thickened and bubbly. Spoon sauce over chicken.