Preheat your oven to 425. Line a baking sheet pan with parchment paper or a silicon baking mat.
Wash and dry the potatoes. Then poke holes all over the potato with a fork.
Place the potatoes on the baking pan and roast for 30 minutes.
At the 30 minute mark, take the potatoes out and lightly brush or spray with olive oil (or vegan butter). Place back in the oven and bake another 30 minutes.
When there's 15 minutes left of baking, dice up the onion and pepper. Add to a skillet with a tablespoon of olive oil and sauté for 4-5 minutes. Add the crumbled seitan at the end and season with chili powder. Sauté the seitan for a minute or two and then remove from the heat.
Drain and rinse the black beans. Season with chili powder or Mexican Fiesta seasoning.
At 60 minutes, remove the baked potatoes from the oven. Slice in half and fill with black beans and seitan and veggies.
Top the potato off with guacamole, lettuce, pico de gallo, queso, diced chives and hot sauce, and serve!