Preheat the oven to 400F. Line a baking sheet with parchment paper.
Place the peppers on the baking sheet, cut-side-up.
In a medium bowl, add the goat cheese, walnuts, parmesan, salt, and pepper. Use your hands to mix until combined so you end up with loose crumbles.
Divide the cheese mixture between the peppers, filling each just below the brim and gently pressing it without packing it in (if you pack it in too much, you’ll run out of cheese!). If you end up having not enough filling for the amount of peppers, you can fill the remaining peppers with any kind of cheese or set them aside.
Drizzle a bit of oil over the peppers. Bake for 15-20 minutes or until the cheese is starting to turn golden brown on top and peppers are charred on the edges.
Meanwhile, in a medium jar or bowl, add the jalapeño and enough apple cider vinegar to cover. Let sit for at least 10 minutes.
Top each pepper with a jalapeño and drizzle of honey.
These are best warm, but also delicious at room temp.