Step 1: In a preheated skillet, heat oil. Add garlic, then onion. Saute until garlic is a little browned and onion transparent.
Step 2: Add chicken, cook for 4 minutes in high heat. Stirring constantly. Pour fish sauce and continue to cook for 2 minutes.
Step 3: Add the vegetable, cook for 2 minutes, stir constantly. Add water, bring to a boil. Add the noodles and cover until cooked thoroughly. Season with salt and pepper.