01 - Preheat oven to 425°F and line a baking sheet with parchment paper.
02 - Toss halved Brussels sprouts and corn kernels with olive oil, salt, and black pepper. Spread evenly on the prepared baking sheet.
03 - Roast for 20-25 minutes, stirring halfway through, until Brussels sprouts are golden and crispy and corn is lightly charred.
04 - Meanwhile, whisk together mayonnaise, sour cream, lime juice, chili powder, smoked paprika, and garlic powder in a large bowl until smooth.
05 - Add roasted vegetables to the bowl with the dressing and toss until well coated.
06 - Transfer to a serving platter. Top with crumbled cotija or feta, chopped cilantro, scallions, and a dusting of extra chili powder. Serve with lime wedges.