01 - Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
02 - In a mixing bowl, combine shredded chicken, 1 cup cheese, sour cream, diced onion, minced garlic, salt, and pepper until evenly blended.
03 - In a saucepan, stir together green enchilada sauce, diced green chiles, ground cumin, and dried oregano. Heat gently until warmed through.
04 - Warm corn tortillas briefly in a dry skillet or microwave to make them pliable.
05 - Spoon 2 to 3 tablespoons of filling onto each tortilla. Roll tightly and arrange seam-side down in the prepared baking dish.
06 - Pour green chile sauce evenly over assembled enchiladas. Sprinkle remaining 1 cup cheese over the top.
07 - Bake uncovered for 20 to 25 minutes, or until cheese is melted and the dish is hot and bubbly.
08 - Garnish with chopped cilantro and sliced green onions before serving.