Preheat your oven to 375°F. Prepare a large baking sheet with parchment paper.
Clean the mushrooms with a damp paper towel to remove any dirt. Carefully remove the stems and set them aside. Arrange the mushroom caps on a baking sheet, stem side up.
Finely chop the reserved mushroom stems. In a medium skillet, melt 2 tablespoons of unsalted butter over medium heat.
Add the chopped mushroom stems and ¼ cup panko breadcrumbs to the skillet. Sauté until the mushrooms are tender, about 3-4 minutes. Add 1 tablespoon of minced garlic and heat until fragrant, about 30 seconds. Season with ½ teaspoon kosher salt and ¼ teaspoon ground black pepper. Remove from the heat and let the mushroom mixture cool slightly.
In a mixing bowl, combine 8 ounces of softened cream cheese, 1 teaspoon of lemon juice, ½ cup of shredded Parmesan cheese, ½ teaspoon of fresh chopped chives, ½ teaspoon of cayenne pepper, ¼ teaspoon Italian seasoning, and 1 tablespoon of chopped Italian parsley.
Add the cooled mushroom stem mixture to the cheese mixture bowl and mix until well combined.
Using a small spoon or piping bag, fill each mushroom cap with the cream cheese mixture. Make sure to generously fill each cap, slightly mounding the filling. Place the stuffed mushrooms in the preheated oven and bake for 20-25 minutes, or until the mushrooms are tender and the tops are golden brown.
Remove the mushrooms from the oven and let them cool for a few minutes. Garnish with additional freshly chopped Italian parsley. Serve warm and ENJOY!