I like to use a variety of color veggies. I used red pepper, bok choy, green onions, broccolini, peapods, and carrots (sliced into ribbons with a peeler).
Sliced, dice, mince, and peel all your veggies and keep them on the side and separated. Some of the veggies will go in at the end for a shorter cooking time.
Preheat a wok or large skillet to higher heat and add a little sesame oil. Cook your denser veggie first to start for 3-4 minutes. Then add a little stir fry sauce.