Press tofu in a tofu press, or between paper towels for 10-15 minutes to remove excess water, then cut into 1-inch cubes.
Heat vegetable oil in a large skillet or wok over medium-high heat.
Add minced garlic and sauté for 30 seconds until fragrant.
Add tofu cubes and stir-fry for 6-8 minutes until golden and crispy on all sides. Remove and set aside.
Add mixed vegetables to the same pan and stir-fry for 4-5 minutes until tender-crisp.
Return crispy tofu to the skillet with vegetables.
Add soy sauce and any optional sauce ingredients, tossing everything together for 1-2 minutes until heated through and well coated.