To a hot sauté pan or wok, add the oil. Once the oil is hot, add the carrots and cook until they start to soften.
Add your bell peppers and broccoli, allowing them to cook until they start to soften.
Finally, add the snow peas and water chestnuts. Continue cooking over medium heat until the vegetables are tender, but crisp.
To make the sauce combine ginger, garlic, cornstarch, water, and soy sauce in a small bowl. Mix until the cornstarch is dissolved and the ingredients are all combined.
When the vegetables are nearly ready, add the sauce mixture to the hot pan, ensuring it coats all the vegetables, and cook for 1-2 minutes.