Take the stems off the shiitake mushroom caps. Chop up the stems, onion, and bacon.
Mix the chopped ingredients with the mayonnaise.
Turn the mushroom caps upside down, and put the mayonnaise mixture in each cap. It's fine if some drops on the foil. Sprinkle with some black pepper.
Top each mushroom cap with cheese. You can shred it with your hands.
Bake in a oven for about 15 minutes. (The cooking time varies depending on the oven.) They are done when the onion and shiitake are cooked through.
Sprinkle with parsley or basil, and they're done.
Story Behind this Recipe
My hubby loves shiitake mushrooms, so I came up with this recipe. It's an easy side dish.
If you don't mix the mayonnaise just before baking, it will get watery, so please be aware of that. If the cheese gets browned too fast in Step 5, cover it with a piece of foil. (If you put the foil on before the cheese is browned it may stick.) Add black pepper to taste.