01 - Preheat oven to 400°F. Line a baking sheet with aluminum foil or parchment paper.
02 - Pound chicken breasts lightly to an even thickness. Brush both sides of each breast with olive oil, then season generously with garlic powder, onion powder, paprika, salt, and black pepper.
03 - Heat a grill pan or cast-iron skillet over medium-high heat. Sear chicken breasts for 3 to 4 minutes per side until a golden crust forms. The chicken should not be fully cooked at this stage. Transfer seared breasts to the prepared baking sheet.
04 - In a small mixing bowl, combine mayonnaise, sour cream, grated Parmesan, shredded provolone, and dried Italian herbs. Stir until well blended. Spread the mixture evenly over the top of each seared chicken breast.
05 - In a separate bowl, toss panko breadcrumbs with melted butter and grated Parmesan until the crumbs are evenly coated. Sprinkle the mixture generously over the Parmesan layer on each breast.
06 - Bake on the center rack for 12 to 15 minutes, until the internal temperature of the thickest breast reaches 165°F and the topping is golden and bubbly.
07 - Remove from the oven and let the chicken rest for 2 minutes before serving. This allows the juices to redistribute for a moist, tender result.