Mexican Street Corn Soup

Name: Mexican Street Corn Soup
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: Mexican
Ingredients: 1/4 cup olive or vegetable oil; 6 cups fresh corn kernels (, from 8-10 shucked cobs (save 6 of the stripped cobs for simmering the soup)); 1 cup chopped yellow onion; 1/4 teaspoon ancho chili powder ((use more or less, depending on your heat preferences)*); kosher salt and freshly ground black pepper; 2 large garlic cloves (, chopped (about 1 tablespoon)); 4 cups chicken or vegetable broth; 1/2 cup sour cream; 1/2 cup grated dry/aged Cotija cheese (, plus additional for garnish (substitute Parmesan or Romano if Cotija is unavailable)); 1 tablespoon fresh lime juice; 1 teaspoon grated lime zest; 2 tablespoons plus 2 teaspoons chopped cilantro (, divided)