Preheat oven to 350 and grease a baking sheet with nonstick cooking spray. Set aside.
Break off stems of mushrooms and set aside. Place mushrooms, top side down onto the prepared baking sheet.
Add butter and garlic to a skillet. Dice mushroom stems and add to skillet. Cook over medium heat until mushrooms begin to soften. Add cream cheese, cheddar cheese, parmesan cheese, and spices and reduce heat to low. Continue to cook and mix until cheese is melted.
Use a 1 tablespoon portion scoop to fill the mushrooms. Fill the scoop halfway and press the filling into the mushroom. Place another half-filled scoop on top.
Bake for 20 minutes until hot. Garnish with fresh chopped or dried parsley, more paprika if desired.