Drain the tofu and press between paper towels for 15 minutes to remove as much moisture as possible.
Cut the pressed tofu into 1-inch cubes and place them in a bowl; toss with cornstarch until every side is lightly coated.
Heat the toasted sesame oil in a large non-stick skillet over medium-high heat.
Add the tofu cubes to the skillet and sear for 8-10 minutes, turning occasionally, until golden and crispy on all sides.
Remove the tofu from the pan and set aside on a plate.
Add the broccoli florets, sliced red bell pepper, and edamame to the same skillet with 2 tablespoons of water.
Cover the pan and steam the vegetables for 3-4 minutes until they are bright green and tender-crisp.
While the vegetables steam, whisk together the tamari, rice vinegar, minced ginger, minced garlic, and red pepper flakes in a small bowl.
Return the crispy tofu to the skillet and pour the sauce over the mixture.
Toss everything together for 1-2 minutes over medium heat until the sauce thickens and glazes the ingredients.
Garnish with sesame seeds and serve immediately while hot.