Sauté Aromatics Heat 2 tablespoons of olive oil in a large pot over medium heat. Add 6 cups of fresh corn kernels, 1 chopped yellow onion, ¼ teaspoon of ancho chili powder, 1 teaspoon of kosher salt, and ½ teaspoon of freshly ground black pepper. Cook for about 8-10 minutes until the corn is softened and slightly charred.
Add Garlic Stir in 2 large chopped garlic cloves, cooking for another 2 minutes until fragrant.
Reserve Corn Mixture Carefully remove 1 ½ cups of the sautéed corn mixture and set it aside in a bowl.
Simmer Cobs Add 4 cups of chicken or vegetable broth and the stripped cobs from the corn to the pot. Bring this mixture to a gentle boil and let it simmer for 20 minutes.
Remove Cobs After simmering, carefully fish out the cobs and discard them.
Blend Soup Lower the heat and stir in ½ cup of sour cream and ½ cup of grated Cotija cheese until combined. Then, pour the mixture into a blender or food processor and blend until smooth and creamy.
Reheat & Finish Pour the blended soup back into the pot and reheat gently. Stir in ¾ cup of the reserved corn mixture, 1 tablespoon of fresh lime juice, and 2 tablespoons of chopped cilantro.
Garnish In a small bowl, toss the remaining reserved corn with the zest of 1 lime and a sprinkle of cilantro. Serve the soup hot, topped with this garnished mixture and extra Cotija cheese.