Add cornstarch to the tofu pieces and toss the tofu to coat all the pieces. Add more cornstarch if needed until the tofu has a thick, even coat on all the pieces.
Lay the tofu out on a baking sheet. Spray the top of the tofu with cooking oil and bake in a preheated oven for 20 minutes. Turn the tofu over halfway through the cooking time.
Heat coconut oil in a wok over medium-high heat. When hot, add green onions, garlic, ginger, and Sriracha to the pan. Cook stirring constantly until fragrant, about 1-2 minutes.