Press the firm tofu between paper towels for 10 minutes to remove excess moisture, then cut into 1-inch cubes.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the tofu cubes to the skillet in a single layer and sear until golden brown and crispy on all sides, about 8-10 minutes.
Add the broccoli florets, sliced red bell pepper, and edamame to the pan, stir-frying for 5 minutes until the vegetables are tender-crisp.
Stir in the minced garlic and grated ginger, cooking for 1 minute until the fragrance fills the kitchen.
In a small bowl, whisk together the tamari, toasted sesame oil, and red pepper flakes.
Pour the sauce over the tofu and vegetables, tossing well to coat everything evenly.
Remove from heat and garnish with sliced green onions before serving immediately.