Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
Press the tofu to remove excess moisture, then cut it into bite-sized cubes.
In a bowl, toss the tofu cubes with cornstarch, garlic powder, salt, and pepper until evenly coated.
Drizzle the tofu with olive oil and spread it on the prepared baking sheet. Bake for 25-30 minutes, flipping halfway, until crispy and golden.
Meanwhile, cook the whole wheat noodles according to package instructions, then drain and set aside.
Prepare the tahini sauce by whisking together tahini and lemon juice with a splash of warm water to achieve a creamy, pourable consistency. Adjust seasoning with salt and pepper.
Lightly steam or blanch the broccoli, red bell pepper, and carrot until they are tender yet crisp (about 3-4 minutes).
Toss the cooked noodles with the tahini sauce, mixing until evenly coated.
To assemble, plate a portion of tahini noodles, top with the fresh vegetables, and add the crispy baked tofu on top.
Serve immediately while warm, and enjoy the contrast of textures and flavors.