Preheat oven to 325 degrees.
Brown meat and add the taco seasoning as instructed on the packet.
Place in the bottom of a 9 x12 casserole dish.
This is the bottom layer.
Next peel and mash avocados and mix well with the tomatoes, onion and cilantro.
Spread mixture on top of the meat.
Layer your choice of sour cream and finally top with the cheese.
Bake for about 20 minutes.
Let it cool and serve with chips.