01 - Preheat oven to 375°F. Grease a 9x13-inch baking dish with cooking spray or a small amount of oil.
02 - Warm olive oil in a skillet over medium heat. Add onion and sauté 3–4 minutes until translucent. Stir in garlic, cumin, and oregano; cook 1 minute until fragrant.
03 - Add shredded chicken, salt, and pepper to the skillet. Mix well to coat with spices and cook for 2 minutes. Remove from heat.
04 - In a small bowl, combine green enchilada sauce with chopped cilantro and lime juice. Stir thoroughly.
05 - Wrap corn tortillas in a damp paper towel and microwave for 45 seconds to make them pliable for rolling.
06 - Spread 1/2 cup of the prepared sauce evenly over the bottom of the greased baking dish.
07 - Place about 2 tablespoons of chicken mixture and a small sprinkle of cheese on each tortilla. Roll tightly and place seam-side down in the dish.
08 - Pour remaining sauce evenly over all enchiladas. Sprinkle remaining Monterey Jack cheese across the top.
09 - Bake uncovered for 25–30 minutes until cheese is melted and bubbly, and sauce is heated through.
10 - Let enchiladas cool for 5 minutes before serving. Top with sour cream, diced avocado, and extra cilantro.