Place each beef steak between two sheets of plastic wrap. Using a meat mallet, pound each piece until it's about ¼ inch thick. This step tenderizes the meat and helps it cook evenly once fried.
In a shallow dish, whisk the eggs together with chopped garlic and parsley. Add the pounded steaks and coat them fully. Let them marinate for at least 10 minutes, or refrigerate up to 2 hours for deeper flavor.
Lift each steak from the egg mixture, letting the excess drip away. Press both sides firmly into the panko breadcrumbs so they're evenly coated. This crust is what gives the dish its signature crunch.
Heat about half an inch of oil in a skillet over medium-high heat. Fry each cutlet for 2-3 minutes per side until deeply golden and crisp. Work in batches so the oil stays hot and the crust stays crunchy.
Transfer the fried cutlets onto a wire rack set over a baking sheet. This lets excess oil drip away instead of pooling underneath, keeping the crust from turning soggy.
Arrange the cutlets on a baking sheet and top each one with marinara sauce, a slice of prosciutto, and mozzarella. Broil for 2-3 minutes until the cheese turns melty and slightly bubbly on top.
Add a spoonful of pesto over each cutlet and sprinkle with fresh parsley. Serve them hot alongside mashed potatoes, fries, or a simple green salad for balance.