01 - Preheat oven to 425°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pound chicken breasts to an even 1/2-inch thickness. Season both sides with salt and pepper.
03 - Whisk eggs in a shallow bowl. In another bowl, combine panko breadcrumbs, grated Parmesan, and Italian seasoning.
04 - Dip each chicken breast in the egg, then coat evenly with the breadcrumb mixture. Place coated chicken on the prepared baking sheet.
05 - Bake chicken for 18-20 minutes, or until golden and cooked through to internal temperature of 165°F.
06 - Spoon marinara sauce over each chicken breast. Top with mozzarella and extra Parmesan. Return to the oven and bake for 7-10 minutes, until cheese is melted and bubbly.
07 - While the chicken finishes, heat olive oil in a large skillet over medium heat. Add garlic and sauté for 30 seconds. Add zucchini noodles and salt; cook for 2-3 minutes, tossing, until just tender but not mushy. Drain any excess liquid.
08 - Divide zucchini noodles among plates. Top each with a piece of Chicken Parmesan. Garnish with fresh basil, if desired.