Position a rack in the center of the oven and heat the oven to 425°F. Put a wire rack over a large, foil-lined baking sheet; spray the rack with cooking spray.
Toast the panko in a dry skillet over medium-high heat, tossing occasionally, until golden brown, about 3 minutes. Transfer to a shallow dish or plate; cool briefly then add the hazelnuts, Parmigiano, rosemary, garlic powder, 3/4 tsp. salt, and a few grinds of pepper
Combine the mayonnaise and mustard in a second shallow dish. Coat the chicken in the mayonnaise mixture and then the panko mixture, and then transfer to the prepared rack. Mist the chicken lightly with cooking spray and bake until just cooked through, 13 to 15 minutes.
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