Tortilla Soup

Bahan-bahan (6 porsi)

• 1 tablespoon extra-virgin olive oil
• 1 large yellow onion (sliced thin (about 1 cup))
• 1 tablespoon minced garlic
• 2 teaspoons chili powder
• 1 teaspoon dried oregano
• 1 15 -ounce can crushed tomatoes
• 1 quart chicken or turkey stock (4 cups )
• 2 cups shredded cooked chicken or turkey meat (about 13 ounces )
• Kosher salt and freshly ground black pepper (to taste)
• 4 6 -inch corn tortillas
• 3 tablespoons vegetable oil
• chopped fresh cilantro (for topping)
• Additional toppings: sliced avocado (Greek yogurt, sour cream, shredded cheddar or jack cheese)