In a large mixing bowl, combine the ground chicken, panko bread crumbs, apple butter, chopped cilantro, cumin, smoked paprika, kosher salt, and ground pepper. Mix gently until just combined.

With damp hands, shape the mixture into 4 equal patties about ¾-inch thick. Place on a parchment-lined plate, cover with plastic wrap, and refrigerate for 10-15 minutes.

Preheat grill or skillet. Cook patties for 8-10 minutes per side until golden and internal temperature reaches 165°F. Add gouda slices during the last minute.

Slice the onion thinly. In a separate skillet, heat olive oil. Sauté onions for about 20 minutes until golden and caramelized.

Assemble burgers on buns with caramelized onions and any additional toppings. Serve immediately.