Preheat the oven to 350 F. Prepare a baking sheet and line with parchment paper. Set it aside.

Wash the mushrooms. Remove the stems and set aside. Dry the caps with a paper towel and place on a baking sheet.

Finely dice the mushroom stems.

In a medium skillet over medium heat, melt the butter. Add minced garlic, diced mushroom stems, salt, and sauté for 2 minutes. Add spinach and sauté for another 2 minutes.

In a bowl, mix cream cheese with the spinach-mushroom mixture. Season with some black pepper and stir well.

Stuff each mushroom cap with the cream cheese and spinach mixture. Add shredded cheese on top.

Place in the oven and bake for 20 minutes, until the cheese is melted.

Garnish with fresh parsley and serve! Enjoy!