- Beat the eggs. Place the meat with the onion in the pan and cook them until brown. Drain out the fat. Now put together the cooked beef with the onion in a large bowl together with the eggs, spinach, mushrooms, mozzarella, parmesan, garlic and seasoning in a large bowl.
- Then sprinkle the melted butter over the ingredients and then bake for 30 minutes at 375?F. Transfer to the serving plates and serve Easy Spinach Beef Bake Recipe immediately.