Grill or char 2–3 cups corn (fresh or frozen), turning until lightly blistered
Cut kernels off 4 ears (or use 2–3 cups cooked corn)
In a bowl, mix 1/2 cup mayonnaise, 1/2 cup sour cream, and 1–2 tablespoons lime juice
Stir in 1–2 teaspoons chili powder and 1 teaspoon garlic powder
Add salt and black pepper to taste
Toss corn with the sauce
Sprinkle with 1/2 cup crumbled cotija cheese (or feta)
Top with chopped cilantro
Finish with extra lime wedges and optional extra chili powder or smoked paprika