Preheat oven to 350. Combine sour cream, salsa verde, milk & black pepper in a bowl. Whisk together.
Pour a layer of the sourcream mixture onto pan. Then cut tortillas in half and layer on top of mixture.
Then take 1-1/2 cansof shredded chicken & layer on top of tortillas. Then dice avocado in shell, scoop out & layer on top of chicken.
Layer more sour cream mixture on top, then add 1/2 the bag of cheese. Repeat- layer tortillas, chicken, avocado, sour cream mixture & rest of cheese.
Sprinkle black pepper on top if desired. Bake 50 minutes, then let cool for 5-10 minutes before serving.
