Vegetarian cookbooks usually focus on tofu, tempeh and grains and tend to ignore seitan.
Are you channeling your best self with this comment? (If you're not sure, check out our Code of Conduct.)
I would check out The Candle Cafe Cookbook. It's not purely seitan focused, but they make some of the best sitan at their restaurants, as far as I'm concerned. I'd assume the cookbook has, at least, quite a few.
You only have to do it "now and then" for endless reward.
5-Minute Baking Prep Trick
Addictive Smoky Grilled Salsa
Go On, Spread Out
Almond Milk Taste Test
Your #1 Loves