Press the extra firm tofu for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
Toss the tofu cubes with cornstarch in a medium bowl until each piece is evenly coated.
Heat the toasted sesame oil in a large non-stick skillet or wok over medium-high heat.
Add the tofu to the skillet and sear for 8-10 minutes, turning occasionally, until all sides are golden and crispy.
Add the broccoli florets and edamame to the skillet, sautéing for 4-5 minutes until the broccoli is bright green and tender-crisp.
In a small bowl, whisk together the tamari, minced ginger, minced garlic, rice vinegar, and sriracha.
Pour the sauce over the tofu and vegetables, tossing for 1-2 minutes until the glaze thickens and coats the ingredients.
Remove from heat and garnish with sesame seeds and sliced green onions before serving.