In a bowl, combine Greek yogurt, mayonnaise, buttermilk, dried parsley, chives, Worcestershire sauce, garlic powder, onion powder, cayenne pepper, salt, and black pepper. Stir until smooth and creamy.

Slice the ciabatta bread and lightly toast it if desired.

Generously spread a layer of the homemade ranch dressing on the inside of each ciabatta slice.

On the bottom slice of each sandwich, layer the sliced chicken, salsa verde, baby arugula, sun-dried tomatoes, fresh cilantro, dill, and slices of gouda and pepperjack cheese.

Place the crispy cooked bacon on top of the cheese layers.

Gently place the top slice of ciabatta over your towering ingredients. Press down slightly.

Slice the sandwich in half and enjoy!