Preheat your oven to 400°F.
Pound breasts to an even thickness, about ⅓ inch thick. You can also place the meat between two sheets of plastic wrap before pounding, if desired.
Season chicken on both sides with 1-2 teaspoons seasoning salt.
Create a breading station with three shallow bowls. Bowl 1, the flour. Bowl 2, the eggs, whisked together with a fork. Bowl 3, mix together panko bread crumbs and remaining seasoning salt.
Coat each breast with the flour, shaking off any excess. Dip each breast into the egg wash, allowing any excess to drip off. Coat the breasts with panko bread crumbs, pressing lightly to adhere.
In a large skillet, heat enough olive oil over medium-high heat to cover the bottom of the skillet. Once the oil is hot, add the breaded chicken and cook until golden brown and crispy, about 2-3 minutes per side. You may need to cook them in batches to avoid overcrowding the pan. Transfer the cooked chicken to a large sheet pan.
Spread a thin layer of marinara sauce over each fried cutlet. Top with shredded or slices of fresh mozzarella cheese. Sprinkle shredded or grated Parmesan cheese over the mozzarella.
Place the sheet pan in a preheated 400°F oven for 10 minutes. Broil on high for 1-2 minutes, or until the cheese is melted and bubbly. Carefully remove the pan from the oven and ensure the chicken has reached a minimum internal temperature of 165°F.
Garnish with fresh basil leaves, if desired. Serve hot with extra marinara sauce and alongside your favorite side dish(es).