Preheat the oven to 350 degrees F. Set a wire rack into a baking sheet lined with aluminum foil.
Sprinkle the chicken on both sides with salt and pepper.
Combine the flour and some salt and pepper in a medium baking dish. In a second baking dish, combine the eggs, milk and minced garlic. In a third dish, combine the panko and garlic salt.
Dredge the chicken breasts through the flour mixture, dusting off any excess; then through the egg mixture, letting excess drip off; and then through the panko breadcrumbs, making sure to coat the breasts on each side. Set the breaded chicken breasts on the wire rack and refrigerate for 30 minutes to allow the breading time to set.
Fill a large, deep skillet halfway with vegetable oil and heat to 375 degrees F on a deep-fry thermometer.
Using tongs, carefully place the breaded chicken in the hot oil, working in batches to avoid crowding the pan. Fry until light golden on both sides, about 4 minutes. Return the chicken to the wire rack.
Dollop 2 tablespoons of Marinara Sauce over each piece of chicken and sprinkle the chicken evenly with the Parmesan and mozzarella. Transfer to the oven and bake until the chicken is cooked through, about 15 minutes. Serve warm.
Nancy's Marinara Sauce:
Heat the olive oil in a large heavy-bottomed pot over a medium-high flame. Add the onions and garlic and saute until the onions are translucent, about 10 minutes. Add the carrots and celery, season with salt and pepper and saute until all the vegetables are soft, another 10 minutes. Add the tomatoes and oregano and simmer, uncovered, over low heat until the sauce has thickened, about 1 hour. Season to taste with more salt and pepper.