If using whole chicken breasts, butterfly and pound them to an even 1/4-inch thickness between plastic wrap. Season with half the salt and pepper.
Set up three shallow dishes: flour seasoned with remaining salt and pepper in the first, beaten egg with 1 tablespoon water in the second, and panko breadcrumbs in the third.
Dredge each cutlet in flour and shake off excess, then dip in egg mixture allowing excess to drip off, and finally press firmly into panko mixture on both sides.
Heat 1 tablespoon butter and olive oil (if using) in a large skillet over medium heat until shimmering.
Cook cutlets for 3-4 minutes per side until deeply golden brown and internal temperature reaches 165°F. Cook in batches if needed.
Transfer cutlets to a wire rack over a baking sheet.
Reduce heat to medium-low, add remaining 1 tablespoon butter to the skillet.
Once butter melts, add lemon juice, zest (if using), and optional Dijon or capers. Swirl the pan gently as sauce bubbles for 30-60 seconds until slightly thickened.
Return cutlets to the skillet and spoon sauce over them, turning once to coat both sides.
Garnish with fresh parsley and serve immediately.
Notes
For extra crispy cutlets, let the breaded chicken rest on a wire rack for 5-10 minutes before frying.
Make sure your oil is hot before adding the chicken to ensure a crispy exterior.
Pat the chicken completely dry before breading to help the coating adhere better.
Nutrition facts are estimates and may vary based on ingredients used, portion sizes, and preparation methods.