Prep the Mushrooms: Preheat your oven to 375°F (190°C). Clean the mushrooms and remove the stems, creating little cups for the filling. Set aside.
Make the Filling: In a bowl, mix together the ricotta cheese, minced garlic, parsley, salt, and pepper. Stir in the chopped prosciutto, combining everything into a smooth filling.
Stuff the Mushrooms: Spoon the ricotta mixture into each mushroom cap, filling them generously. If desired, sprinkle breadcrumbs on top for a crunchy finish.
Bake: Arrange the stuffed mushrooms on a baking sheet lined with parchment paper. Drizzle with olive oil and bake for 20 minutes, until the mushrooms are tender and the filling is golden.
Serve: Let cool slightly before serving. Garnish with fresh parsley for an added touch.