Preheat the oven to 375°F (190°C) and lightly grease a baking dish with cooking spray or oil.
In a shallow bowl, whisk together the eggs and milk until well combined.
In another shallow bowl, mix the breadcrumbs, grated Parmesan cheese, garlic powder, salt, and black pepper until evenly distributed.
Dip each chicken breast into the egg mixture, allowing any excess to drip off, then coat it thoroughly in the breadcrumb mixture. Press the breadcrumbs onto the chicken to ensure a good coating.
Place the coated chicken breasts into the prepared baking dish in a single layer.
Bake in the preheated oven for 25 minutes, or until the chicken is cooked through and the internal temperature reaches 165°F (75°C).
Once cooked, remove from the oven and let rest for a few minutes before serving.