Ingredients

• 3 tablespoons sour cream
• 3 tablespoons lime juice
• 1 tablespoon mayonnaise
• 1/4 teaspoon salt
• 2 serrano chilis, sliced
• 6 ears of corn
• 2 tablespoons vegetable oil
• 2 cloves garlic
• 1/2 teaspoon chili powder
• 1 cup cotija cheese (or feta cheese as a substitute)
• 3/4 cup cilantro
• 3 scallions