Preheat the oven to broil.
Place the chicken breasts on a cutting board. Using a boning knife, or other thin flexible knife, slice the breasts in half horizontally.
2 large chicken breasts
Add each chicken breast to the middle of a large piece of plastic wrap and pull the bottom part of the plastic wrap over the chicken to cover it. Using a meat mallet or a sturdy pot, pound the chicken out to 1/3 inch thick. Repeat with the remaining chicken until all have been pounded thin. Set aside.
Add the flour to a wide, shallow bowl and season with salt and pepper. Set aside.
½ cup flour, kosher salt and black pepper
In a second wide, shallow bowl, add the eggs and a pinch of salt. Whisk until the eggs are homogeneous then set aside.
2 large eggs
In a third wide, shallow bowl, add the panko, Italian breadcrumbs, cheese, garlic, and lemon zest together. Whisk to combine and set aside.
½ cup panko breadcrumbs, ½ cup Italian breadcrumbs, ¼ cup Parmesan cheese, 1 lemon
Add the olive oil to a large, deep skillet over medium heat. Prepare two sheet trays with wire racks and set aside.
½ cup olive oil
Working with one chicken piece at a time, add the chicken to the flour and coat both sides. Shake off any excess, then transfer to the eggs. Coat in the eggs, allowing any excess to drip off, then move it to the breadcrumb mixture. Press firmly to adhere the breadcrumbs to the chicken, then transfer to one of the racked sheet trays. Repeat with remaining chicken.
Once the oil is shimmering, slowly add two chicken breasts to the pan. Gently shake the pan to prevent the chicken breasts from sticking to the bottom. Cook for four to five minutes, or until the chicken is deeply golden brown. Flip and repeat on the other side.
Transfer to the other racked sheet tray and season with salt. Repeat with remaining chicken.
Once all the chicken is cooked, spoon several tablespoons of sauce over each chicken breast. Top each with mozzarella cheese and broil for two to four minutes, or until the mozzarella is melted and has browned in a few spots.
8 ounce whole milk mozzarella
Remove from the oven and serve with spaghetti, additional sauce, Parmesan cheese, and basil.
1 pound spaghetti, Parmesan cheese, fresh basil