How to Make It
Preheat oven to 450°F. Cut chicken breasts against the grain into 16 equal slices. Combine chicken slices, 3/4 cup buttermilk, and 1 tablespoon vinegar in a medium bowl; toss to coat. Let stand 10 minutes.
Stir together crushed cornflakes, cornmeal, garlic powder, and paprika in a shallow dish. Working with 1 chicken slice at a time, remove from buttermilk mixture, shaking off excess; dredge in cornflake mixture, and place on a baking sheet lined with parchment paper. Spray tops of breaded chicken with cooking spray. Bake at 450°F for 10 minutes. Turn chicken over, and spray tops with cooking spray. Bake until crisp, about 10 minutes. Sprinkle evenly with salt.
While chicken bakes, stir together mayonnaise, dill, pepper, grated garlic, and remaining 1/4 cup buttermilk in a bowl.
Drizzle remaining 2 tablespoons vinegar evenly over chicken "wings." Serve immediately with dipping sauce.