Preheat oven to 350*F. In medium mixing bowl combine spinach, onion, egg and margarine, mixing well. Add remaining ingredients and mix again until thoroughly combined. Using rounded teaspoonfuls, shape spinach mixture into 16 equal balls. Spray non-stick baking sheet with cooking spray; arrange balls on sheet.
Bake until balls are cooked through and lightly browned, 18-20 min. 4 balls 6 calories.