From Tasty.

@vindelgiudice https://tasty.co/recipe/italian-sausage-stuffed-mushrooms

Italian sausage-stuffed mushrooms are the ultimate party bite: savory, hearty, and packed with cozy flavor. Tender baby bella mushrooms are filled with a rich, herby mix of Italian sausage, fennel, celery, and buttery bread stuffing, then baked until golden and crisp on top. Each bite delivers the perfect balance of juicy mushroom and crunchy, flavorful filling. Serve them hot for an irresistible appetizer that’s guaranteed to disappear fast.