Spray baking dish with Avocado Oil.
Saute turkey, mushrooms and onion in pork lard for about 15 minutes, or until onion is translucent. Sprinkle with ¼ teaspoon salt and ¼ teaspoon of garlic powder.
Transfer turkey mixture to the prepared baking dish. Top with chunks of cream cheese and spinach.
Top spinach with provolone cheese slices.
Preheat oven to 375°F.
Meanwhile, beat eggs, heavy whipping cream and remaining seasonings in a bowl or large measuring cup.
Pour the egg mixture over the turkey and spinach mixture. Use a fork to incorporate the eggs into the casserole.
Bake the casserole for 25 minutes.
Remove casserole from the oven and top with shredded cheese. Bake for an additional 20 minutes, or until the cheese is bubbly and the eggs are set.
Cool for 10 - 15 minutes before serving.
