Preheat your oven to 400°F (200°C).
Place the cubed sweet potatoes and dried chickpeas onto a large rimmed baking sheet.
Drizzle generously with olive oil, then sprinkle the Birria seasoning and sea salt over everything. Use your hands to toss thoroughly until every piece is well-coated.
Spread them out into a single, flat layer (don't crowd them, or they will steam instead of roast!).
Roast for 25-30 minutes, tossing halfway through, until the potatoes are tender and browned on the edges and the chickpeas are crispy. Serve drizzled with avocado crema.