Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the garlic and ginger, and sauté for about 30 seconds until fragrant.
Add the sliced onions and cook for 2 minutes until they begin to soften.
Add the mushrooms and stir-fry over high heat for 4–5 minutes until they release their moisture and start to brown.
Stir in the red and green bell peppers, cooking for another 2–3 minutes until they remain slightly crisp.
Add the soy sauce, The Holly Tree Organic Black Pepper Powder, The Holly Tree Organic Cayenne Pepper Powder, and sea salt. Toss well to evenly coat all the vegetables.
Cook for another minute, allowing the spices to bloom and the flavors to come together.
Garnish with chopped spring onions and finish with an extra light sprinkle of The Holly Tree Organic Black Pepper Powder before serving.