Peel the garlic clove and drop it into a small food processor. Process until finely minced.
Add the fresh herbs to the processor and process until they are finely minced as well.
Add the salt, pepper, yogurt and buttermilk and process until everything is combined.
Transfer to a jar with a lid and refrigerate until needed.
Taste to adjust the seasonings before serving.
Slice the tops off of the peppers and remove the inner veins and seeds. Use a sharp knife to carve out a jack-o-lantern face.
Line the peppers with plastic wrap and fill with the ranch dressing.
Serve with assorted veggies, cut in sticks and packed in treat bags.