Place a little olive oil in your skillet. Heat on medium heat.
Add onion to pan and saute until translucent.
Add garlic & broccoli. Give it a good stir.
Add cooked chicken and sauce. Bring to a simmer.
When sauce begins to thicken, add Chinese cabbage - go ahead and fill the pan, b/c the cabbage will wilt and reduce in size (a lot!)
Carefully mix cabbage into the sauce/chicken/veggies and your done! It only takes a few minutes for the cabbage to begin to wilt, and I like mine to still have a little crunch to it.
Garnish with toasted sesame seeds and green onions if desired.
Serve over brown rice (or white, or fried, or noodles....)