Preheat your oven to 190°C (375°F). Line a baking sheet with parchment paper.
Gently clean the mushroom caps with a damp cloth and remove the stems carefully, setting them aside.
Finely chop the mushroom stems and sauté them in a small skillet with a bit of olive oil and minced garlic until fragrant, about 2 minutes. This deepens their earthy aroma and drives out excess moisture.
In a mixing bowl, combine the sautéed stems, softened cream cheese, chopped parsley, thyme, breadcrumbs, salt, and pepper. Mix until the filling is smooth and well integrated.
Using a small spoon or scoop, generously stuff each mushroom cap with the filling, pressing down slightly to pack it in.
Arrange the stuffed mushrooms on the prepared baking sheet, spacing them evenly. Bake in the preheated oven for about 20 minutes until the tops are golden brown and bubbling.
Once baked, remove the mushrooms from the oven and let them rest for 5 minutes. Squeeze fresh lemon juice over the tops for brightness and serve warm.