I love stir-fries. It is a great way for me to get my vegetables. For a quick meal I will get frozen cut vegetables and cook with a little soy sauce and serve with rice. But I really do prefer fresh vegetables. Usually I use broccoli, peppers, mushrooms, celery, carrots, and onions. Sometimes I will buy bok choy, which is an Asian cabbage, and cut the leaves and stems separately and add them in also.
Now in my garden I am growing some other easy to grow members of the cabbage (brassica) family. I can add for a slightly spicy flavour, for texture or colour mustards greens, tatsoi, mizuna, kotmasuna, or yukina. These are all easy to grow in our climate.
I like to experiment and I encourage you to also.