Press the tofu (remove moisture). *To do this, first drain the tofu. Then either 1) add tofu to a tofu press for at least 30 minutes (or overnight if possible)- example in photo below, or 2) slice the tofu in half lengthwise (into 2 pieces) and then place on a cutting board covered in a few pieces of paper towel. Cover the tofu with another few pieces of paper towel and add something heavy on top of it, such as a cast iron skillet. Let sit for about 15 min.
When the tofu is fully pressed, cut into cubes by first cutting in half lengthwise, then cutting into 1 inch strips, then small cubes.
Meanwhile, you can prepare the marinade. To do so, to a shallow baking dish, add the soy sauce, garlic powder, onion powder, cayenne pepper, black pepper, and vegetable broth. Stir to combine, then add the tofu cubes to the sauce. Shake around to coat the tofu completely and let sit for about 30 minutes.
When ready, save and drain the liquid from the tofu (you'll be using it later to coat the tofu bites, if desired). You can do this by using your hands to remove the tofu or using a colander/strainer.
Next, spray the air fryer basket with nonstick oil, if preferred. Add the tofu cubes to the crisper plate in a single layer (depending on the size of your air fryer, you may have to do 2 batches). Add the basket to the air fryer and set to 10-15 minutes at 390 F. Press 'Start' to begin. Press 'Pause' halfway through the cooking time to shake the pan to toss the tofu around in the basket. Then press 'Start' again to resume. When the time has elapsed, check for doneness. Note that the time needed to make this tofu will vary by a few minutes, depending on how pressed the tofu is (the longer you press, the shorter the cooking time). If you prefer your tofu crispier, you can air fry another 2-3 minutes until desired crispiness.
Remove the tofu from the air fryer basket (by either dumping them out, or using tongs) and if desired, transfer to the bowl of sauce. Stir to coat. There will be quite a bit of sauce so you can discard about half or use to mix in with rice, etc. Serve!
Storage and Reheating Instructions: Store in the fridge in an airtight container for 4-5 days. To reheat, you can pop back into the air fryer for 2-3 minutes at 390 F.