Slice the bell peppers in half lengthwise and discard seeds & ribs. Set aside.
In a medium bowl, stir together cream cheese, cheddar cheese, walnuts and jalapeño until combined.
Spoon the mixture into the bell pepper halves and transfer to the basket of the air fryer.
Air fry for 7-15 minutes depending on how browned you want the cheese.
Serve hot or room temperature. Enjoy!
Notes
*Depending on the size of the peppers, this makes between 24-48 bell pepper halves. One serving is ⅛ of the recipe.*Feel free to omit the jalapeño for a mild stuffed baby pepper.*You can also add 1 teaspoon of chopped fresh herbs like basil, parsley, cilantro, or thyme.*If you don't have a jalapeño, you can substitute with 1 teaspoon red pepper flakes or ½ teaspoon cayenne pepper in a pinch. Taste the mixture and add more if needed.*One baby bell pepper is about one ounce, so you'll need around 16 baby bell peppers.