Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper. Gently wipe the mushroom caps clean with a damp cloth and carefully remove the stems, setting them aside.
Mix the minced garlic with olive oil and a pinch of salt, then use a pastry brush to generously coat the inside of each mushroom cap. This helps them brown beautifully and infuses flavor.
In a small bowl, combine the toasted breadcrumbs, grated Parmesan, a splash of truffle oil, and a squeeze of lemon juice. Mix until the ingredients are evenly coated and fragrant.
Gently stuff each mushroom cap with the breadcrumb mixture, pressing softly to fill the cavity without overflowing. Arrange the stuffed caps on the prepared baking sheet.
Bake the mushroom caps in the oven for about 15-20 minutes, until the topping is golden brown and crispy and the mushrooms are tender and juicy.
Once baked, remove the mushrooms from the oven and let them rest for 5 minutes. Drizzle with a little more truffle oil or lemon if desired, and serve warm, garnished with fresh herbs if you like.