Spray skillet with cooking spray, heat over medium-high heat. Add broccoli and garlic together. Saute, stirring pretty constantly for about 3-4 minutes.
Add the teriyaki sauce and sprinkle with pepper. Combine well. Stir and cook till desired doneness. I leave mine a good 10 minutes because I like my broccoli extra soft, but if you like yours with a crunch still, only cook it a couple more minutes.