HEAT oven to 425ºF.
MIX peanut butter, tomato juice, sugar, tomato paste, lime juice, ginger and garlic; set aside.
COAT chicken with combined cinnamon and oregano. Heat oil in nonstick skillet on medium-high heat. Add chicken; cook 2 min. on each side or until golden brown on both sides. Transfer to baking dish; top with peanut sauce.
BAKE 20 to 25 min. or until chicken is done (170ºF), turning occasionally and basting with sauce from bottom of dish. Top with onions and nuts.