Crunchy Lemonade Drumsticks

INGREDIENTS

• Kosher salt and freshly ground black pepper
• 1/3 cup buttermilk
• Olive-oil cooking spray
• 3 tablespoons packed light brown sugar
• 2 cups panko (Japanese breadcrumbs)
• 2 tablespoons grated lemon zest
• Pinch of cayenne pepper
• 1 tablespoon chopped fresh thyme
• 12 skin-on chicken drumsticks (3 1/2 to 4 1/4 pounds)
• 1/4 cup mayonnaise
• 1/2 cup fresh lemon juice