Melt butter in a nonstick skillet over medium heat. Add panko and stir until golden brown. Transfer to a bowl and let fully cool.
In a large bowl, add very soft cream cheese (see note 1), sour cream, mayo, pickle juice, garlic powder, and pepper. Beat with a hand mixer for 1 minute until smooth.
Use a spatula to stir in the diced pickles, dill, and chives until fully combined.
Cover and refrigerate for 30 minutes to allow the flavors to meld and the dip to thicken.
Spoon the dip into a shallow serving dish. Sprinkle toasted panko on top right before serving.
Notes
Note 1: If the cream cheese isn’t fully softened, the dip will be lumpy. Cut it into chunks and microwave in 15-second bursts until very soft.Storage: Store the dip in an airtight container in the fridge without the topping. It thickens and develops more flavor as it sits. Add the panko just before serving.