Prepare the Garbanzos : Position a rack in the center of your oven. Drain the chickpeas in a colander and rinse them thoroughly under cool, running water. Spread the rinsed chickpeas onto a clean kitchen towel, fold the towel over, and gently rub to remove as much moisture as possible. Discard any loose skins that separate.
Preheat Equipment : Set the oven to 400°F (205°C). Place the empty 12-inch cast-iron skillet on the center rack to heat up along with the oven.
Season the Chickpeas : While the oven heats, transfer the thoroughly dried chickpeas to a large mixing bowl. Drizzle with the olive oil and sprinkle with the smoked paprika, garlic powder, onion powder, and fine sea salt. Toss with a spoon until every chickpea is evenly coated.
Initial Crisping : Once the oven reaches temperature, carefully remove the hot skillet. Cautiously pour the seasoned chickpeas into the skillet in a single, even layer. Return the skillet to the oven and roast for 20 minutes.
Final Roasting : After 20 minutes, give the skillet a gentle shake to roll the chickpeas around for even browning. Place it back in the oven to continue roasting for another 10 minutes.
Cool and Serve : The chickpeas are done when they are a deep golden-brown and rattle when the pan is shaken. Let them cool in the skillet for a few minutes—they will become even crispier as they cool. Serve warm.