Place the tofu in a resealable plastic bag with the avocado oil and 2 tablespoons of soy sauce. Shake the bag to coat the pieces.
Spread the tofu in a single layer on a large baking sheet and bake for 25 minutes, stirring halfway.
Meanwhile, in a small pot, combine the remaining soy sauce, sriracha sauce, sesame oil, crushed garlic, and coconut sugar. Bring the heat to medium for 3 minutes.
While the sauce heats, whisk together the corn starch with ¼ cup of water in a small bowl.
Pour the corn starch slurry into the pot and cook on medium-low for 10 minutes, or until the sauce has thickened.
Once thickened, add the sauce to a large frying pan and add the cooked tofu. Let simmer for 10 minutes.
Shake on some sriracha powder after cooking.
Serve, garnished with scallions and sesame seeds and with rice on the side, if desired.