01 - Pat the chicken breasts dry with paper towels. If thick, place between two sheets of plastic wrap and pound to an even 1/2-inch thickness using a meat mallet. Season both sides generously with salt and black pepper.
02 - Arrange three shallow bowls: the first with all-purpose flour, the second with beaten eggs and whole milk, and the third with a blended mixture of Romano cheese, Parmesan cheese, and Italian breadcrumbs.
03 - Dredge each chicken breast first in the flour, shaking off excess, then dip into the egg wash, and finally coat thoroughly with the cheese-breadcrumb mixture. Press firmly to ensure the coating adheres evenly on both sides.
04 - Heat 1 tablespoon butter and 2 tablespoons olive oil in a large skillet over medium-high heat. Add the breaded chicken and cook 4 to 5 minutes per side until golden brown and cooked through (internal temperature of 165°F). Work in batches if needed, adding more oil as necessary. Transfer cooked cutlets to a plate and tent with foil to keep warm.
05 - Reduce the heat to medium and add the remaining 1 tablespoon butter and 1 tablespoon olive oil to the same skillet. Sauté the minced garlic for 30 seconds until fragrant. Pour in the chicken broth, lemon zest, and lemon juice. Simmer for 3 minutes, using a spatula to scrape up the browned bits from the bottom of the pan.
06 - Return the chicken cutlets to the skillet and spoon 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.