Place oven rack on the top shelf and warm broiler on high.
Line a baking sheet with parchment paper or a silcone baking mat.
Slice mini bell peppers in half lengthwise. Remove any seeds, and place the peppers cut side up on the baking sheet.
Grate pepper jack cheese.
Fill the sliced peppers with the grated pepper jack cheese.
Top the cheese with sliced olives and chopped walnuts.
Broil the stuffed peppers until the cheese just melts. (Keep an eye on the peppers, as this will happen qucikly and you don't want to scorch the nuts.)
Pull the peppers out of oven and top with cilantro or parsley if desired, and a sprinkle of flaky salt.
Enjoy!
Notes
Serve this flavorful, cheesy appetizer with a glass of your favorite California Zinfandel!