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