1. Preheat your oven to 350°F (175°C) and grease casserole dish.
2. In a large skillet, cook the lean ground beef over medium heat until it browns. Season with salt and pepper. Set aside.
3. Using a food processor, blend the cream cheese and add the eggs one at a time until a smooth mixture forms. Pour this creamy mixture over the ground beef and stir well to combine.
4. Transfer the ground beef and cream cheese mixture into casserole.
5. In the same skillet, melt the butter over medium heat, and cook the sliced mushrooms until they soften and turn a golden brown color. (Optional: add some garlic to mushrooms in this step.) Sprinkle the mushrooms with salt, dried parsley, and black pepper.
6. Place the sautéed mushrooms on top of the hamburger and cream cheese mixture in the casserole dish. If you prefer, you can also add grated cheese on top.
7. Bake the casserole for approximately 20 to 25 minutes, or until it sets. Be careful not to overcook it.
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