01 - Preheat the oven to 425°F and line a baking sheet with parchment paper.
02 - Toss the cauliflower florets with olive oil, salt, and pepper. Spread evenly on the prepared baking sheet.
03 - Roast for 25–30 minutes, flipping halfway, until cauliflower is golden and tender with crispy edges.
04 - While the cauliflower roasts, mix the mayonnaise, sour cream, chili powder, smoked paprika, garlic powder, and lime juice in a large bowl.
05 - When the cauliflower is done, immediately transfer it to the bowl with the sauce. Toss to coat thoroughly.
06 - Add half of the cotija cheese, half the cilantro, red onion, and jalapeño (if using), and toss again.
07 - Transfer to a serving platter. Sprinkle with remaining cotija, extra chili powder, and cilantro. Serve warm with lime wedges.