Press the tofu to remove excess moisture, then cut into bite-sized cubes. Toss lightly with a pinch of cornstarch for extra crispiness.
In a small bowl, whisk together the soy sauce, minced ginger, minced garlic, sesame oil, cornstarch, and vegetable broth to create the garlic ginger sauce. Set aside.
Heat a wok or large skillet over medium-high heat with a splash of oil. Pan-fry the tofu cubes until golden and crispy on all sides, about 5 to 7 minutes. Remove tofu from the pan.
In the same pan, add the broccoli, green beans, red bell pepper, and yellow bell pepper. Stir-fry for 4 to 5 minutes until tender-crisp.
Return the tofu to the pan and pour the garlic ginger sauce over the mixture. Toss continuously for 1 to 2 minutes until the sauce thickens and coats everything evenly. Serve hot.