In a medium bowl, combine the softened cream cheese, 1/2 cup of the shredded cheddar cheese, jalapeno, salt and black pepper. Using a spoon, fill each mushroom cap with the cheese mixture. Press the remaining shredded cheddar cheese in the tops.
Place on a baking sheet and cook for 15-20 minutes, or until cheese is fully melted.
Garnish with chopped parsley and serve!
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