In a small bowl, blend peanut butter, water, soy sauce and sugar; set aside. In a wok or large skillet, heat oil over high heat. Add garlic and pepper; stir-fry 30 seconds. Add chicken, stir-fry until firm and white, about 5 minutes. Add broccoli or spinach, stir-fry until bright green, about 3 minutes. Stir in peanut butter mixture. Cook, stirring constantly until sauce is smooth, about 3 minutes. Serves 4.
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