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 flour, the second with beaten eggs and milk whisked together, and the third with Romano cheese, Parmesan cheese, and breadcrumbs mixed thoroughly.
03 - Dredge each chicken breast first in the flour, shaking off excess. Dip into the egg wash, then press firmly into the cheese-breadcrumb mixture, ensuring an even coating on all sides.
04 - Heat 1 tablespoon of butter and 2 tablespoons of 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 to an internal temperature of 165°F. Work in batches if needed, adding more oil as necessary. Transfer cooked cutlets to a plate and cover loosely to keep warm.
05 - Reduce heat to medium. Add the remaining 1 tablespoon of butter and 1 tablespoon of 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 over the top. Simmer together for 2 minutes to allow the flavors to meld. Garnish with chopped fresh parsley and lemon slices. Serve immediately.