Mayonnaise is used for simplicity, as well as for its wonderful ability to brown up and form a nice glaze. If you wish for something lower calorie and lower cholesterol, you can use whipped egg whites instead, although it may not brown nearly as well. You could whip the whites and fold in the whisked yolk if you want loft and richness as well. If you do not have green garlic, just use a single clove of garlic minced or just season the pan by cooking the whole clove in the oil you’ll cook the spinach in. Don’t have oyster mushrooms? Don’t worry about it. Cook ¼ of a finely diced white or yellow onion and cook it until soft before adding spinach. Although the recipe looks long, it is really not. There are just lots of tips to ensure this is an easy dish.