Combine tomato sauce, picante sauce, cumin, garlic salt and oregano; mix well. Cut chicken into 1" pieces; sprinkle with salt and pepper. Cook chicken and onions in oil in large skillet over medium heat, stirring frequently, until chicken is lightly browned and almost cooked through, about 5 to 7 minutes. Stir tomato sauce mixture into skillet; mix well. Stir in zucchini. Cover and simmer 5 minutes. Uncover; cook and stir about 1 minute to thicken sauce, if necessary. Serve with additional picante sauce. Serves 4.