Press the firm tofu for at least 15 minutes to remove excess moisture, then cut into 1-inch cubes.
In a small glass bowl, whisk together the tamari, rice vinegar, toasted sesame oil, grated ginger, minced garlic, and red pepper flakes.
Heat the avocado oil in a large non-stick skillet over medium-high heat until it begins to shimmer.
Add the tofu cubes to the skillet in a single layer and sear for 3-4 minutes per side until each face is golden brown and crispy.
While the tofu sears, steam the broccoli florets and shelled edamame together until they are vibrant green and tender-crisp.
Pour the garlic-ginger sauce over the tofu in the skillet, tossing constantly for 60 seconds until the sauce reduces to a sticky, aromatic glaze.
Divide the cooked quinoa and steamed vegetables between plates, top with the glazed tofu, and garnish with thinly sliced green onions.