01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Clean the mushroom caps and gently remove stems. Pat dry thoroughly and set aside.
03 - In a medium bowl, combine the cream cheese, mozzarella, cheddar, green onions, jalapeños, garlic, smoked paprika, black pepper, and salt. Mix until smooth and well combined.
04 - Spoon or pipe the cheese filling into each mushroom cap, slightly mounding the filling above the rim.
05 - In a small bowl, mix breadcrumbs with melted butter and parmesan. Sprinkle evenly over the filled mushrooms.
06 - Arrange the stuffed mushrooms on the prepared baking sheet, leaving space between each cap.
07 - Bake for 20-25 minutes, or until the mushrooms are tender and the tops are golden brown and crispy.
08 - Remove from the oven. Garnish with fresh parsley and serve warm.