I just wing it honestly. I use firm/extra firm tofu and press it (put paper towels on both sides of the tofu and something heavy on top like a bowl of water and leave it for 15 minutes or so). The just fry it in maybe a tablespoon of oil with some seasoning. A little turmeric gives it a nice color and flavor.

Hash browns, onions and bell peppers go a long ways too if you have them around.