Take a skillet on medium heat, add the oil, then the coated tofu, sprinkle the pepper, garlic powder, and onion powder onto the tofu, and stir. Let this cook covered for about 5 minutes, stir, heat covered another 5 minutes, stir, then cook covered, stirring every few minutes until it's as crispy as you want. Then add the sauce; this thickens up quickly, so stir, only about a minute or two while it's thickening.