Increase the heat to medium-high, and add the ground beef to the skillet. Cook until browned, breaking it apart with a spatula as it cooks, about 5-7 minutes.
While the beef is cooking, in a small bowl, whisk together the soy sauce, honey (or maple syrup), and rice vinegar.
Once the beef is fully browned, drain any excess fat from the skillet.
Add the diced bell peppers and broccoli florets to the skillet with the beef. Pour the prepared teriyaki sauce over everything and stir to combine. Cook for an additional 3-5 minutes until the vegetables are tender but still crisp.
Remove from heat and let it cool slightly.
Divide the teriyaki ground beef mixture into meal prep containers over a bed of cooked rice or quinoa.
Garnish with chopped green onions and sprinkle with sesame seeds before sealing the containers.
Notes
Store in the fridge for up to 5 days. Reheat in the microwave or on the stovetop.