Press the tofu to remove excess moisture.
Cut the tofu into 1-inch cubes.
Marinate the tofu in soy sauce for 10 minutes.
Heat vegetable oil in a large skillet over medium-high heat.
Add the tofu and cook until golden brown on all sides.
Remove tofu from the skillet and set aside.
In the same skillet, add sesame oil and stir-fry garlic and ginger until fragrant.
Add sliced bell pepper, broccoli, carrot, and mushrooms; stir-fry for 5 minutes.
Return the tofu to the skillet and mix well.
Sprinkle cornstarch over the mixture and stir until well combined.