Start by slicing each chicken breast horizontally to make two thin cutlets. Place them between plastic wrap and pound until about ¼-inch thick. This helps everything cook evenly and keeps the chicken tender.
Whisk the eggs, milk, salt, and pepper in one shallow bowl. In another bowl, mix the breadcrumbs, parmesan, Italian seasoning, garlic powder, chili powder, salt, and pepper. Make sure the dry mixture is well combined for uniform flavor in every bite.
Dip each piece of chicken into the egg mixture, letting any excess drip off. Then press both sides firmly into the breadcrumb mixture so it sticks well. Lay each breaded piece on a lined baking sheet.
Preheat the oven to 400°F. Spray the tops of the cutlets lightly with olive oil spray to help them crisp. Bake for 17–20 minutes until golden and the internal temperature reaches 165°F. Flip halfway through for extra-even browning.
Let the cutlets rest for 5 minutes before slicing or serving. This helps the juices settle inside so the chicken stays tender and flavorful.