In a large mixing bowl, whisk together the vital wheat gluten, nutritional yeast, garlic powder, onion powder, paprika, and poultry seasoning until well combined.
In a separate bowl, combine the vegetable broth, soy sauce, and olive oil. Gradually pour the wet mixture into the dry ingredients, stirring with a spoon until a dough forms.
Knead the dough for 5-7 minutes on a clean surface. The dough should be firm but pliable. Avoid over-kneading to prevent toughness.
Divide the dough into 4-6 pieces and shape them into fillets, strips, or nuggets, depending on your preference.
In a large pot, bring the vegetable broth, soy sauce, garlic powder, onion powder, and liquid smoke to a gentle simmer.
Place the seitan pieces into the simmering broth. Cover and let simmer for 45-60 minutes. Do not let the broth boil, as this can ruin the texture.
Once cooked, let the seitan cool in the broth for about 15 minutes. It can now be sliced, shredded, or stored for future use.