Make the chicken: Preheat the oven to 375*F.
Combine the panko breadcrumbs and parmesan cheese together in a medium bowl, whisking with a fork.
Coat the chicken thighs in melted butter, then roll in the panko breadcrumb and parmesan mixture.
Line a baking sheet with aluminum foil, and arrange the chicken thighs side by side.
Bake for 15 minutes, until the chicken is cooked through.
While the chicken is cooking, arrange the salad. Place the salad greens in the bottom of a large salad bowl, then layer with the rest of the salad toppings, side by side, on top.
Make the dressing: In a large bowl, whisk the buttermilk, mayonnaise and vinegar together until smooth. Fold in the blue cheese crumbs.
Slice the chicken and add it to the salad.
Drizzle the salad with blue cheese dressing and serve immediately.