Preheat oven to 350 degrees.

With a paper towel, wipe off any dirt that may be on each mushroom and remove their stems. Place buttons into a small bowl and toss with sherry and olive oil. Set aside.

Chop mushroom stems into small pieces and add them to a small bowl along with panko, parsley, cream cheese, fennel, garlic, and Italian seasoning. Using your hands, mash ingredients together until fully incorporated.

Stuff each button mushroom with mixture and place into a baking dish. Bake for 30-45 minutes or until the mushrooms are beginning to wrinkle and stuffing is browned and crisp. Remove from oven and plate. Top each mushroom with sriracha, drizzle with balsamic glaze, and serve.