Salmon and spinach stuffed mushrooms are a flavorful and elegant appetizer or side dish. Start by removing the stems from large mushrooms and brushing them with olive oil. Bake the mushrooms in the oven until they're slightly softened. Meanwhile, prepare the filling by combining cooked and flaked salmon, sautéed spinach, breadcrumbs, Parmesan cheese, and your favorite herbs or spices. Fill the mushroom caps with the salmon and spinach mixture, then return them to the oven and bake until the filling is heated through and the mushrooms are tender. These stuffed mushrooms are a delicious and impressive addition to any meal or gathering.