Preheat the oven to 410 degrees Fahrenheit and line a large baking sheet with parchment paper.
Using a small paring knife remove mushroom stems by placing each mushroom on a cutting board upside down and sliding the knife around the stem at a slight angle inward. The stem should pop out easily when you pull.
Brush the mushrooms with 1 tablespoon olive oil and place on the prepared baking sheet cap side down.
In a small bowl combine panko breadcrumbs, remaining olive oil, parmesan cheese, thyme leaves and a little salt and pepper.
Place Boursin cheese in a piping bag or a ziploc bag (I like the freezer kind because they're stronger) and cut the corner to make a small opening.
Pipe the cheese into each mushroom cap until you fill all 15 mushrooms.
Top each mushroom with the panko mixture. For extra cripiness you can also spray the stuffed mushrooms with oil (I used avocado oil spray).
Bake the stuffed mushrooms in the preheated oven for 20 minutes or until the tops are golden brown.
Serve hot.