In a large skillet or dutch oven, heat the EVOO over medium-high heat. Season the chicken with salt and pepper; add to the skillet and cook, turning once, until browned, about 10 minutes. Transfer to a plate.
Add the chorizo to the skillet and cook for 1 minute. Add the frying pepper, celery, onion, garlic and chile. Cover partially and cook until the vegetables are just softened, about 3 minutes. Stir in the sherry and cook, stirring up any browned bits.
Add the tomatoes, stock and chicken to the pan. Partially cover and simmer until cooked through, 15 minutes. Stir in the parsley and olives.