- 1 tablespoon canola oil
 - 1 small onion, finely chopped
 - 1 clove garlic, minced
 - 1 jalapeno pepper, finely chopped (remove seeds for milder flavor if desired)
 - 1/4 teaspoon chili powder
 - 1 (28 ounce) can whole peeled tomatoes in puree
 - 1 teaspoon fresh lime juice
 - Coarse salt and freshly ground pepper
 - 8 (6 inch) corn tortillas
 - 12 ounces shredded cooked chicken, (skin removed)
 - 12 ounces shredded Monterey Jack cheese
 - 2 tablespoons pickled jalapenos, minced (optional)
 - Sour cream, for serving (optional)
 - Fresh cilantro leaves, for serving (optional)
 
- Make the sauce: In a medium saucepan, warm oil over medium low heat. Add onion, garlic, jalapeno, and chili powder. Cook until onions are translucent, about 8 minutes. Add tomatoes and 1/2 cup water. Season with salt and pepper. Bring to a boil, reduce heat, and simmer, crushing tomatoes lightly with the back of a spoon. Cook until tomatoes are tender and sauce is slightly chunky, 15 to 20 minutes. Add lime juice, and season with salt and pepper.
 - Preheat oven to 450 degrees F. Make the enchiladas: In a medium skillet over medium high heat, warm tortillas, 10 to 15 seconds per side. Working with one tortilla at a time, top with 2 ounces of chicken, 1 ounce of cheese, and pickled jalapenos, if using; roll tightly. Place enchiladas, seam-side down, in a 9-by-13-inch baking dish.
 - Pour sauce over tortillas, and top with remaining cheese. Bake until cheese has melted, 5 to 7 minutes. If desired, place under broiler for 1 to 2 minutes for a crispier top. Serve with sour cream and fresh cilantro, if desired.