Preheat oven to 425°F. Line a sheet pan with parchment and lightly oil it.
Combine Parmesan and panko in a shallow dish. Stir to mix well.
Whisk mayonnaise, garlic powder, Italian seasoning, paprika, salt, and pepper in a bowl.
Add chicken to the bowl. Toss until every piece is evenly coated.
Dredge chicken in the Parmesan mixture, pressing so the coating sticks.
Arrange on the pan, spacing pieces apart. Drizzle or mist with olive oil.
Bake 12–15 minutes, flipping halfway, until golden and 165°F inside.
Broil 1–2 minutes for extra color if desired. Rest briefly.
Top with parsley and serve hot with marinara for dipping.