01 - Place chicken breasts between two pieces of plastic wrap and pound to ½-inch thickness using a meat mallet. Season both sides generously with salt and freshly ground black pepper.
02 - Arrange three shallow bowls: one with all-purpose flour, one with beaten eggs and water whisked together, and one combining grated Romano cheese with breadcrumbs.
03 - Dredge each chicken breast in flour, shaking off any excess. Dip into the egg mixture, then press firmly into the Romano-cheese and breadcrumb mixture, ensuring an even, thorough coating on all sides.
04 - Heat olive oil and 2 tablespoons of butter in a large skillet over medium heat. Working in batches if needed, add the breaded cutlets and cook for 3 to 4 minutes per side until deeply golden and cooked through to an internal temperature of 165°F. Transfer to a plate and tent loosely with foil.
05 - Pour off excess oil from the skillet. Add the fresh lemon juice and lemon zest to deglaze the pan, scraping up any browned bits from the bottom. Stir in the remaining 2 tablespoons of butter and simmer for 1 to 2 minutes until the sauce slightly thickens.
06 - Return the chicken cutlets to the skillet and spoon the lemon-butter sauce over the top. Cook for 1 to 2 minutes to heat through. Sprinkle with chopped fresh parsley and serve immediately, garnished with extra lemon slices if desired.