In a small bowl, mix together the vegetable broth, light soy sauce, dark soy sauce, sugar, black pepper, and sesame oil. Set aside.
In another small bowl, combine cornstarch and water, stirring well until mixed. Set aside.
Cooking
Heat ¼ cup of water in a large skillet over medium-high heat. Once boiling, add broccoli and sprinkle with a pinch of salt. Cover and steam for 1 minute.
Uncover the pan and stir broccoli, cooking until al dente. Transfer broccoli to a plate.
Wipe the pan clean. Heat 2 tablespoons of peanut oil over high heat, add sliced mushrooms, and sear without stirring for 1 minute. Flip mushrooms and stir occasionally for 2-3 minutes until browned and juices have evaporated.
Push mushrooms to one side of the pan. Add remaining ½ tablespoon peanut oil, dried chili peppers, minced garlic, minced ginger, and sliced green onions. Stir until chili peppers turn dark red.
Add cooked broccoli back to the pan, pour the prepared sauce over, and stir. Cook for 30 seconds.
Stir the cornstarch mixture again and swirl it into the pan. Cook and stir until the sauce thickens.
Transfer stir fry to a plate and serve hot over steamed rice or as a side dish.
Notes
For a quick meal, serve hot over steamed rice or noodles. Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in microwave or stovetop, adding water or broth if needed.