This is maybe the best chicken sandwich we've ever had. The buttermilk marinade makes such a difference in the flavor, infusing so much extra depth into the chicken breast. Traditionally chicken thighs are used in sandwiches like this, but breast can be just as good with the right care. The sauce with the relish offers a creamy, pickle-y heat that compliments the flavors of the chicken so well. This recipe is on the easy side and is guaranteed to satisfy hungry Dungeons and Dragons players!