Spoon about 2 tablespoons marinara on each chicken cutlet; top each with 2 slices of mozzarella ... Divide spaghetti evenly among 4 plates, and top with warmed marinara (about 3/4 cup each) and ...

Thinly sliced chicken breast cooks quickly ... Beat the eggs in a shallow dish or plate that's big enough to hold one cutlet.

Transfer the cooked chicken slices to a plate. Add the remaining oil to the pan and fry the onions for 3 minutes. Cover with a lid, lower the heat and cook for another 10 minutes to soften.