Preheat the oven to 375 degrees F.
Lightly oil a 9 x 13 baking dish or rub with butter to coat..
Heat avocado oil in a large skillet over medium heat.
Add onion, and cook stirring, until translucent, about 2-3 minutes. Stir in garlic, oregano and cumin stirring for about 1 minute.
Remove from heat and stir in green chiles.
In a large bowl, combine green chile mixture, chicken, 1/3 cup salsa verde or salasa and cilantro. Stir in 1 1/2 cups cheese; season with salt and pepper, to taste.
Lay the tortilla flat and spoon a large ½ cup of the chicken mixture into the center of the tortilla.
Roll and place seam side down onto the prepared baking dish. Repeat with remaining tortillas and chicken mixture. Top with remaining salsa verde or salsa and remaining 1 1/2 cups cheese.
Place into the oven and bake until bubbly, about 35-40 minutes.
Serve immediately, topped with dollops of sour cream.