Cut the jalapenos in half lengthwise and scrape out the seeds and membrane with a small spoon. (You can wear gloves to do this. Otherwise, wash your hands really well afterward.)
Mix the cream cheese, cheddar cheese, garlic, green onion, and paprika together in a medium mixing bowl to make the filling. Do a taste check and add salt and pepper as desired. In a small mixing bowl, stir together the breadcrumbs, melted butter, and parsley until evenly moistened to make the topping.
Fill each jalapeno half with the cream cheese mixture. Then, dip the filling side of each popper into the topping so that it's completely coated.
Arrange the jalapeno poppers in the basket of your air fryer so that the filled side faces up. It's okay if they're touching. You don't want them to tip over, and having them touch can make things more stable.
Cook at 390 degrees F for 6-8 minutes or until the filling is bubbly and the topping is starting to turn golden brown.
Use tongs to carefully remove the poppers from the air fryer. Serve warm or room temperature with ranch dressing for dipping, if desired.