Step 1

Heat the oil in a large saucepan over medium heat. Add the chili powder, garlic, onion, chipotle and 1 teaspoon salt and cook, stirring, until the onion softens, about 5 minutes. Add the turkey stock, tomatoes, 1/2 cup water and half the tortilla chips; bring to a boil, then reduce the heat to a simmer and cook, uncovered, until the soup has reduced slightly, about 25 minutes. Add the corn and cook for 5 minutes.

Step 2

Remove from the heat and stir in the turkey and lime juice. Adjust the seasoning with salt, if needed. Divide the soup among 4 bowls. Top with the cheese, cilantro, the remaining tortilla chips and avocado, if using.