01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Place chicken breasts between two sheets of plastic wrap. Using a meat mallet, pound to an even thickness of about ¾ inch.
03 - Season both sides of each chicken breast evenly with garlic powder, onion powder, paprika, salt, and black pepper.
04 - Arrange three shallow bowls: place flour in the first, beat eggs with milk in the second, and combine panko breadcrumbs with ½ cup Parmesan cheese in the third.
05 - Dredge each seasoned chicken breast in flour, shaking off excess. Dip into the egg mixture, then press firmly into the panko-Parmesan blend, ensuring full even coverage on all sides.
06 - Heat a thin layer of oil in a large skillet over medium-high heat. Sear breaded chicken breasts for 2–3 minutes per side until golden brown and crisp.
07 - Transfer seared chicken to the prepared baking sheet. Bake for 15–20 minutes until the internal temperature reaches 165°F.
08 - While the chicken bakes, stir together ranch dressing, ¼ cup Parmesan cheese, and chopped parsley in a small mixing bowl until well combined.
09 - Remove chicken from the oven. Spoon ranch Parmesan sauce evenly over each breast. Sprinkle shredded Monterey Jack and remaining Parmesan cheese on top.
10 - Return chicken to the oven and broil for 2–3 minutes until the cheese is fully melted and bubbly. Serve hot, garnished with additional parsley if desired.