01 - Preheat oven to 425°F or air fryer to 400°F. Line a baking sheet with parchment paper.
02 - Toss tofu cubes gently with cornstarch until evenly coated on all sides.
03 - Place coated tofu on the prepared baking sheet, drizzle with oil, and toss to coat evenly. Arrange in a single layer without overcrowding.
04 - Bake or air fry for 20-25 minutes, flipping halfway through cooking, until golden brown and crispy on all sides.
05 - In a small bowl, whisk together soy sauce, sesame oil, rice vinegar, maple syrup, ginger, garlic, and sriracha until well combined.
06 - Pour sauce mixture into a skillet over medium heat. Stir in the cornstarch-water slurry and cook for 1-2 minutes, stirring constantly, until sauce thickens and bubbles.
07 - Add crispy tofu to the skillet and gently toss to coat evenly in the thickened sauce, being careful not to break the tofu pieces.
08 - Serve immediately while hot, garnished with toasted sesame seeds and sliced scallions.