Remove stems from cremini mushrooms
Sauté minced garlic and diced shallot or onion in butter
Add finely chopped mushroom stems to the pan and cook
Mix Boursin cheese, cream cheese, and cooked mushroom mixture together
Stir in sliced green onion and salt
Fill mushroom caps with the cheese and mushroom mixture
Combine panko, parmesan, and melted butter or olive oil for the crispy topping
Sprinkle the crispy topping mixture over the filled mushrooms
Bake until golden and crispy
