Step 1: Prepare the chicken - Start by slicing each chicken breast in half lengthwise. You are aiming for thin cutlets about half an inch thick. If they are uneven, give them a light pound so they cook evenly.
Step 2: Mix the egg coating - In a bowl or shallow dish, whisk together the eggs, mustard, lemon zest, and garlic powder. Take a moment here to really combine everything well so each bite gets that flavor.
Step 3: Prepare the breadcrumb mixture - In another dish, mix the breadcrumbs with the grated Parmesan, salt, and black pepper. This is where the magic happens, so make sure it is evenly mixed.
Step 4: Bread the chicken - Dip each cutlet into the egg mixture first, letting any excess drip off. Then press it into the breadcrumb mixture, making sure both sides are well coated. Use your hands to gently press the crumbs in so they stick nicely.
Step 5: Arrange on the baking sheet - Place the coated cutlets on a baking sheet, leaving a bit of space between each one. This helps them crisp up instead of steaming.
Step 6: Add olive oil - Drizzle a little olive oil over the top of each cutlet. This helps create that golden finish in the oven.
Step 7: Bake to perfection - Bake in a preheated oven at 400 degrees for 10 minutes. Flip each cutlet and bake for another 10 minutes until golden and cooked through.
Step 8: Finish and serve - Sprinkle with fresh parsley and a little extra lemon zest if you like. Serve warm and try not to eat them all straight off the tray.