Press the extra firm tofu for 15 minutes using a heavy object to remove excess moisture, then cut into 1-inch cubes.
Place the tofu cubes in a bowl and toss with arrowroot powder until each piece is lightly and evenly coated.
Heat the toasted sesame oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the tofu to the skillet in a single layer and sear for 3-4 minutes per side until golden brown and crispy.
Remove the tofu from the pan and set aside; add the broccoli, sliced bell pepper, and edamame to the same pan with two tablespoons of water.
Cover the pan for 2 minutes to steam the vegetables until they are tender-crisp and vibrant green.
In a small jar, whisk together the tamari, rice vinegar, minced ginger, and minced garlic.
Return the crispy tofu to the pan, pour the sauce over the mixture, and toss for 1 minute until the glaze thickens and coats everything.
Sprinkle with toasted sesame seeds and red pepper flakes before serving immediately.