Cut the broccoli, mushrooms, bell pepper, green onions, and onions. Set aside. Cut the beef into thin slices and set.
Minced the garlic and ginger. Sliced the peppers. In a small bowl, add soy sauce, water, brown sugar, and cornstarch. Mix well then add in garlic, ginger, and chili peppers.
In a frying pan, heat up the oil on medium heat. When the oil is hot, cook the beef. Add salt and black pepper.
Add the vegetables when the beef is cooked and stir for 2 minutes.
Pour the sauce over. Stir until the sauce thickens then turn off the stove.