Preheat oven to 395°F. Line a baking sheet with parchment paper.
In a large bowl, combine the ground chicken, panko breadcrumbs, egg, onion, garlic, mayonnaise, pickle brine, Worcestershire sauce, hot sauce, salt, black pepper, smoked paprika, onion powder, garlic powder, cayenne pepper, chicken bouillon powder, and parsley. Mix gently until just combined.
Form the mixture into approximately 20 meatballs about 1½ inches wide. Place evenly spaced on the prepared baking sheet.
Bake for 16–18 minutes or until the internal temperature reaches 165°F. Broil for 1 minute if desired for lightly crisp edges. Let rest for 2 minutes.
While the meatballs bake, prepare the Nashville hot sauce. In a small saucepan over low heat, melt 2 tablespoons butter with the oil.
Whisk in the cayenne pepper, smoked paprika, chili powder, garlic powder, brown sugar, salt, hot sauce, honey, apple cider vinegar, and black pepper. Cook gently for 30–60 seconds until smooth and fragrant. Do not scorch the spices.
Remove from heat and whisk in the remaining 1 tablespoon butter until glossy.
Transfer the warm meatballs to a large bowl. Pour the warm sauce over the meatballs and toss gently until evenly coated.
Let the meatballs rest for 1–2 minutes so the sauce adheres fully.
Serve immediately with dill pickle chips, ranch dressing, soft white bread, and optional coleslaw.