Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
Clean the mushrooms, remove the stems, and hollow them out slightly for more stuffing space.
In a skillet over medium heat, cook the Italian sausage until browned, then drain excess grease.
Add cream cheese, garlic, green onions, and parsley to the skillet, mixing until creamy.
Stuff each mushroom cap generously with the sausage mixture and place them on the baking sheet.
Sprinkle parmesan cheese and panko breadcrumbs over the top for a crispy finish.
Bake for 18-20 minutes until golden brown and the mushrooms are tender.
Garnish with extra chopped chives and serve warm!