Press the tofu for at least 15 minutes to remove excess moisture, then cut into bite-sized cubes.
In a bowl, gently toss tofu cubes with cornstarch until evenly coated.
In another bowl, whisk together low sodium soy sauce, minced garlic, ginger, and sesame oil.
Add the tofu cubes to the sauce mixture and allow them to marinate for 10 minutes.
Preheat the oven to 425°F (220°C). Meanwhile, cut broccoli into florets and slice the red bell pepper into strips.
On a baking sheet, arrange the broccoli and bell pepper. Drizzle a small amount of extra oil if desired and season lightly.
Roast the vegetables in the oven for about 20-25 minutes, stirring halfway through, until they are tender and slightly charred.
While the vegetables roast, heat a nonstick skillet over medium heat. Add the marinated tofu and pan-fry until all sides are golden and crispy, approximately 6-8 minutes.
Plate the crispy tofu alongside the roasted vegetables and sprinkle with sesame seeds before serving.