01 - Combine buttermilk and hot sauce in a bowl. Add chicken thighs, cover, and refrigerate for at least 30 minutes or up to overnight for deeper flavor penetration.
02 - Whisk together flour, sugar, baking powder, and salt in a large bowl. In a separate bowl, whisk eggs, buttermilk, melted butter, and vanilla. Pour wet ingredients into dry and mix just until combined. Set aside.
03 - Mix flour, cornmeal, Cajun seasoning, paprika, garlic powder, onion powder, salt, and black pepper in a shallow dish. Remove chicken from marinade, letting excess drip off. Dredge each piece in flour mixture, pressing firmly to adhere.
04 - Heat about 1 inch of vegetable oil in a deep skillet to 350°F. Fry chicken pieces for 5-7 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Drain on paper towels.
05 - Preheat waffle iron and lightly grease with nonstick spray. Pour about 1/2 cup batter per waffle onto the iron and cook according to manufacturer's instructions until golden and crisp.
06 - Place a hot waffle on each plate, top with Cajun fried chicken, and drizzle generously with maple syrup. Garnish with chopped chives or parsley if desired.