Roasted Corn with Lime, Parmesan and Chili

INGREDIENTS

• 1 tablespoon sour cream, at room temperature
• 1 tablespoon mayonnaise, at room temperature
• 3 tablespoons grated Parmesan
• ¼ cup milk, at room temperature
• Juice of 1 large lime, plus wedges for serving
• 3 medium ears corn
• Salt and freshly ground black pepper
• Generous pinch of cayenne
• 1 1/2 tablespoons olive oil