Prepare the crispy baked tofu according to your preferred method so it is ready while you make the sauce.
In a medium bowl, combine orange zest, orange juice, tamari (or soy sauce), rice vinegar, maple syrup, grated ginger, and garlic powder; whisk until well blended.
In a small bowl, mix 1 tablespoon cornstarch with 1 tablespoon cold water to make a smooth slurry; set aside.
With about 5 minutes left on the tofu baking time, pour the orange sauce into a medium non-stick skillet and heat over medium until it comes to a light simmer.
Stir the cornstarch slurry again, then add it to the simmering sauce and stir continuously; simmer for about 6–7 minutes, stirring often, until the sauce thickens.
Turn off the heat, add the baked tofu cubes to the skillet, and toss gently to coat each piece evenly with the orange sauce.
Serve the orange tofu over rice, quinoa, or noodles and spoon any extra sauce over the grains or bowls as desired.