Preheat your oven to 190°C (375°F) and prepare a baking sheet lined with parchment or lightly greased.
Gently clean the mushroom caps with a damp cloth, then carefully remove the stems and set them aside for the stuffing.
Finely chop the mushroom stems and set aside. In a mixing bowl, combine the chopped stems, minced garlic, chopped parsley, lemon zest, and toasted breadcrumbs.
Add the softened cream cheese and a splash of olive oil to the bowl, then season with salt and pepper. Mix everything until well combined and creamy.
Using a small spoon, generously stuff each mushroom cap with the prepared mixture, pressing gently to pack in the flavors.
Arrange the stuffed mushrooms on the prepared baking sheet, cap-side up, and drizzle lightly with olive oil for a shiny, crisp top.
Bake in the preheated oven for 20-25 minutes, until the tops are golden brown and bubbling, and the mushrooms are tender.
Remove from the oven and let rest for 5 minutes—this helps the filling set and prevents spilling.
Garnish with extra chopped parsley if desired, then serve warm and enjoy the aromatic, crispy-topped stuffed mushrooms.