Preheat the oven to 400°F.
Cut the boneless chicken breasts into nugget-sized pieces, approximately 1 inch by 2 inches.
In a shallow dish, combine the Panko breading, Italian seasoned breadcrumbs, garlic powder, and grated Parmesan cheese.
Stir until the coating mixture is evenly combined.
Melt the butter in a separate shallow microwave-safe dish.
Dip each chicken piece into the melted butter, coating all sides.
Transfer the butter-coated chicken to the breadcrumb mixture.
Coat each piece completely, pressing the breadcrumb mixture onto the chicken as needed.
Arrange the coated chicken pieces in a single layer on a baking sheet.
Leave space between each piece to allow even baking.
Bake at 400°F until the chicken is cooked through and the coating is golden brown.
The chicken should reach an internal temperature of 165°F.
Serve warm with marinara sauce, ranch dressing, honey mustard, garlic aioli, or your preferred dipping sauce.