Preheat oven to 400 degrees. Drain and press the tofu, and then cut it into cubes. Add the tofu to a bowl and pour the liquid aminos over the tofu. Combine ½ cup of corn starch, salt, pepper, garlic powder in a medium-sized bowl. Mix in the cubed tofu and coat each piece with the cornstarch. 

Line a baking sheet with parchment paper and spray with oil. Add the cornstarch coated tofu to the baking sheet. Spray with more oil and bake for 25-30 minutes

While you wait for the tofu, add all of the sauce ingredients to a small bowl (excluding the corn starch and water). In a second bowl, combine the corn starch and water. 

Once the tofu has finished baking, in a skillet over low/medium heat, add the sauce and stir until it begins to bubble. Next, add in the corn starch and mix a bit more. After about 2-3 minutes, add in the tofu and combine until the tofu and cook for 3-5 minutes, mixing frequently. 

Serve over rice with veggies.