Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Rinse the chickpeas and pat them thoroughly dry with a clean kitchen towel to ensure they become crispy.
In a large mixing bowl, combine the dried chickpeas, cubed seitan, and broccoli florets.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing well to coat every piece.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the items for even roasting.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chickpeas are golden and the broccoli edges are slightly charred.
Transfer the roasted mixture to a bowl, sprinkle with nutritional yeast, and drizzle with fresh lemon juice before serving warm.