Heat oven to 400°F. Line a baking sheet with a wire rack; coat with nonstick spray.
Season chicken with ¼ teaspoon salt.
In a shallow dish whisk together flour, paprika, garlic powder, black pepper, cayenne, and remaining ¾ teaspoon salt. In a separate dish add egg whites and lightly beat. Pour panko into a third separate dish.
Dredge chicken in flour mixture, then dip in egg whites to coat. Dip chicken in panko, flipping and lightly pressing to coat. Place breaded chicken on rack-lined baking sheet. Generously coat all sides of breaded chicken with cooking spray.
Bake chicken until golden brown and crispy and an instant-read thermometer inserted in the center registers 165 degrees, 20–30 minutes. Let chicken rest on rack 5 minutes before serving.
Serve with honey mustard or preferred dipping sauce.
