Layer 2 cups Jack cheese and 1 cup cheddar in bottom of dish (I only did the two cups Jack cheese).
Layer remaining ingredients: avocados, tomatoes, green onions, cream cheese.
Cover with remaining cheese and cover all with egg/milk mixture.
Bake for 45 minutes.
Let cool for 10 minutes. Enjoy
Notes
Optional addition to the California Egg Casserole, Italian chicken sausage, cooked and cut into chunks. Another friend tried diced ham and said it was really yummy. Cooked chopped bacon would also be a nice addition.