01 - Set oven to 375°F (190°C) to preheat.
02 - Whisk eggs in a shallow dish. Season chicken breasts on both sides with salt and pepper.
03 - Dip each chicken breast first in beaten eggs, then coat thoroughly with breadcrumbs.
04 - Arrange breaded chicken breasts on a parchment-lined baking sheet and bake for 20 minutes.
05 - Remove from oven. Spread marinara sauce over each chicken breast and top with shredded mozzarella and grated Parmesan.
06 - Return to oven and bake for an additional 15 minutes, or until cheese is melted and golden and chicken reaches an internal temperature of 165°F (74°C).
07 - Allow to rest 5 minutes, then serve warm.