Set Aside 1 Teaspoon Of Seasoning From Seasoning Packet (Discard Remaining Seasoning Or Save For Another Use). Break Noodles Into Small Pieces And Place In A Microwave-Safe Dish; Add Warm Water. Microwave, Uncovered, On High For 2 Minutes. Drain And Set Aside. In A Small Bowl, Combine The Cornstarch, Garlic Powder, Pepper Flakes And Reserved Seasoning. Stir In The Cold Water, Soy Sauce And Vinegar Until Smooth; Set Aside. In A Large Skillet Or Wok, Heat Oil; Stir-Fry Pork And Mushrooms For 5 Minutes. Add Broccoli And Red Pepper. Stir-Fry For 4-5 Minutes Or Until Vegetables Are Crisp-Tender And Pork Is No Longer Pink. Stir Cornstarch Mixture And Stir Into Skillet. Add Noodles And Onions. Bring To A Boil; Cook And Stir For 2 Minutes Or Until Thickened.