In A Skillet Or Wok Coated With Nonstick Cooking Spray, Stir-Fry The Pork Until No Longer Pink, About 4 Minutes. Add Zucchini, Mushrooms, Onion And Green Pepper; Stir-Fry For 3 Minutes Or Until Crisp-Tender. In A Small Bowl, Combine Cornstarch, Soy Sauce, Water And Garlic Powder Until Smooth. Add To The Skillet. Bring To A Boil; Cook And Stir For 1-2 Minutes Or Until Thickened And Bubbly. Serve Over Rice.