Mushroom Caps Stuffed with Shrimp Mushroom Caps stuffed with Shrimp is a fast and easy recipe. Great served as an appetizer or as a light side dish. If shrimp isn't your thing, don't add it. Smoked salmon, lump crab or finely shredded mozzarella cheese sometimes called 'fancy' shredded cheese can be used instead. Mushroom Caps