Preheat your oven to 400°F (200°C). Press the tofu to remove excess moisture, then cut it into bite-sized cubes.
In a bowl, toss the tofu with a light spray of non-stick oil (or optionally use a minimal brush of oil), and season with a pinch of salt and pepper. Arrange the tofu cubes on a baking sheet lined with parchment paper.
Bake the tofu for 20-25 minutes, flipping halfway through, until the edges are golden and crispy.
While the tofu bakes, prepare the spicy peanut sauce. In a small bowl, whisk together the natural peanut butter, soy sauce, sriracha, fresh lime juice, minced garlic, and grated ginger. In a separate small bowl, lightly whisk the egg white, then gradually blend it into the sauce to enhance its protein content and create a subtle, silky texture. (If desired, gently warm the sauce in a pan over low heat while stirring constantly.)
Prepare the lettuce leaves by washing and drying them thoroughly.
Once the tofu is crispy, transfer it to a mixing bowl and toss with the prepared spicy peanut sauce to evenly coat.
Spoon the sauced tofu into the butter lettuce leaves and top with the shelled edamame. Garnish with an extra drizzle of sauce if desired.
Serve immediately and enjoy your protein-packed, flavorful afternoon snack!