Heat a large skillet over medium heat. Add the sesame oil to the pan. Once hot, add the cubed tofu and season with garlic powder, ginger and black pepper.
Sauté for about 7 minutes or until golden brown. Then add the soy sauce and maple syrup.
Stir in the mushrooms, bell pepper and green onion. Sauté for an additional 5 minutes until vegetables are tender.