Prepare Tofu: Start by pressing the tofu to remove excess moisture. Cut the pressed tofu into small cubes.
Make the Teriyaki Sauce: In a bowl, combine the soy sauce, maple syrup, rice vinegar, garlic powder, and ginger powder. If you prefer a thicker sauce, mix the cornstarch with a tablespoon of water and add it to the sauce.
Cook Tofu: Heat one tablespoon of sesame oil in a large skillet over medium heat. Add the cubed tofu and cook until golden brown on all sides, about 10 minutes, flipping occasionally.
Add Vegetables: To the skillet, add the broccoli, bell pepper, and carrot. Stir-fry for another 5-7 minutes, until the vegetables are slightly tender but still crisp.
Glaze the Tofu: Pour the teriyaki sauce over the cooked tofu and vegetables in the skillet. Stir well to coat everything evenly. Cook for an additional 2-3 minutes to heat through and thicken the sauce.
Serve: Divide the cooked quinoa among serving bowls. Top with the teriyaki tofu and vegetables. Garnish with chopped green onions and a sprinkle of sesame seeds.