Sauté onion in a teaspoon of butter until tender (and mushroom if using)
Whip six eggs in bowl with whisk for about a minute.
Add salt and pepper to taste.
Stir in 1/4 cup cottage cheese.
Crumble in goat cheese.
Add avocado, stir carefully so as not to mash up the avocado.
Pour into a lightly sprayed pie pan or loaf pan.
Bake at 350 degrees for 25 minutes if in a pie pan, 35 minutes if in a loaf pan.
Remove, slice, and enjoy!