01 - Pat the chicken breasts dry with paper towels. If unevenly thick, place between two sheets of plastic wrap and pound to a uniform ½-inch thickness using a meat mallet. Season both sides generously with salt and freshly ground black pepper.
02 - Arrange three shallow dishes: the first with all-purpose flour, the second with eggs beaten together with whole milk, and the third with a combined mixture of Romano cheese, Parmesan cheese, and Italian breadcrumbs.
03 - Dredge each seasoned chicken breast through the flour, shaking off excess. Dip into the egg wash, allowing any extra to drip off. Press firmly into the cheese-breadcrumb mixture, ensuring an even, adhered coating on all sides.
04 - Heat 1 tablespoon of butter and 2 tablespoons of olive oil in a large skillet over medium-high heat. Carefully add the breaded chicken and cook for 4 to 5 minutes per side until deeply golden and cooked through to an internal temperature of 165°F. Work in batches, adding more oil between batches as needed. Transfer finished cutlets to a warm plate and tent with foil.
05 - Reduce the skillet heat to medium. Add the remaining 1 tablespoon of butter and 1 tablespoon of olive oil. Sauté the minced garlic for about 30 seconds until fragrant. Pour in the chicken broth, lemon zest, and lemon juice. Simmer for 3 minutes, using a spatula to scrape up any browned bits from the bottom of the pan.
06 - Return the chicken cutlets to the skillet, spooning the lemon sauce generously over each piece. Simmer together for 2 minutes to allow the flavors to meld. Garnish with chopped fresh parsley and lemon slices. Serve immediately alongside pasta or a crisp green salad.