Press the tofu: Drain the tofu and press it between paper towels or a clean kitchen towel with a weighted plate for 10–15 minutes.
This helps it crisp up.
Cut and coat: Cut the tofu into 3/4-inch cubes. Toss gently with 2 tbsp cornstarch and a pinch of salt until coated.
Mix the sauce: In a bowl, whisk soy sauce, rice vinegar, maple syrup, vegetable broth, chili-garlic sauce, and 1 tbsp cornstarch. Set aside.
Cook the tofu: Heat 1–2 tbsp oil in a large skillet or wok over medium-high heat.
Add tofu in a single layer. Cook 6–8 minutes, turning occasionally, until golden and crisp on all sides. Transfer to a plate.
Stir-fry vegetables: Add another 1 tbsp oil if needed.
Add the white parts of green onion, garlic, and ginger. Stir for 30 seconds until fragrant. Add vegetables and a pinch of salt.
Stir-fry 3–5 minutes until tender-crisp.
Sauce it up: Return tofu to the pan. Give the sauce a quick whisk and pour it in. Stir constantly for 1–2 minutes until the sauce thickens and coats everything.
Finish: Turn off the heat.
Stir in toasted sesame oil and most of the sesame seeds. Taste and adjust salt, sweetness, or heat as needed.
Serve: Spoon over rice or toss with noodles. Top with the green parts of green onion and remaining sesame seeds.