Preheat your oven to 390°F (200°C).

On each slice of ciabatta bread, spread the marinara sauce evenly. Sprinkle cheese over both halves of the bread. Place the prepared bread in the oven and bake for about 12 minutes, until the cheese has melted and the bread is toasted.

While the bread is baking, heat oil in a pot for deep frying.

Season the chicken breast with salt and pepper. Set it aside.

In a small bowl, beat the egg with milk.

Pour flour into a shallow dish. In another dish, place the breadcrumbs.

First, coat the chicken in flour, shaking off any excess.

Dip the floured chicken into the egg mixture, ensuring it's well coated.

Finally, coat the chicken in breadcrumbs, pressing gently so the crumbs adhere.

Carefully deep fry the chicken breast for 2-3 minutes, or until it's fully cooked and golden brown. Remove the chicken from the oil and let it drain on a wire rack.

To assemble the sandwich, place the fried chicken on one slice of the toasted ciabatta. Add a teaspoon of marinara sauce and a few fresh basil leaves on top of the chicken.

Cover with the other slice of toasted bread. Slice the sandwich in half and serve immediately.