- Preheat the oven to 350°F. Remove mushroom stems; finely chop and set aside. Arrange mushroom caps on a rimmed baking sheet. 
- In a medium bowl, combine the cream cheese, cheddar cheese, salt, and pepper. Set aside. 
- Set a medium skillet over medium high heat and add the oil. When the oiil is hot, add the chopped mushroom stems and jalapeno. Cook for 3 minutes, frequently stirring until mushrooms have released their liquid. Add the garlic and continue cooking for an additional 30 seconds. Remove from heat. 
- Stir the mushroom and cheddar mixture into the cheese mixture. Adjust seasoning to taste. Spoon heaping portions of filling into the mushroom caps. 
- In a small bowl, combine the Panko breadcrumbs, melted, butter, and paprika. Sprinkle over the filled mushrooms. 
- Bake for 20 minutes, or until lightly golden. Serve warm or at room temperature.