Cut your boneless, skinless chicken breast into 1" chunks. Season with salt, pepper and Italian seasoning.
In a shallow dish (pie pan works great) combine eggs and flour. In another shallow dish pour in your breadcrumbs.
Take each piece of seasoned chicken and dip into the egg mixture and then the panko breadcrumbs.
Once all pieces have been coated add your olive oil to a frying pan. You only need about 1/4 inch in the base.
Heat on medium for a few minutes until the oil is glimmering. Test one piece of chicken and see if it starts to fry up quickly. If so, add about another 5-6 pieces, just don't over crowd your pan.
Cook about 2 minutes on each side until they are golden brown.
Remove and place on a paper towel lined plate.
Finish cooking the remaining chicken pieces.
Get a pot of water boiling. Add some salt and your shells. Cook according to package.
Once finish place on a plate to cool.
In a bowl combine your egg, cheeses, Italian seasoning and salt and pepper. Mix well to combine.
Pour about 1/4 of your jar of marinara sauce into the base of your baking dish.
Use a teaspoon to add the cheese mixture to your cook shells. I add about 2 teaspoons per shell.
Place the cheese stuffed shell (opening up) into the marinara filled based of the baking dish.
Once all the cheese filled shells are in the pan you can add the breaded chicken to the top of the cheese, inside the shells.
If the pieces are too big cut them in half.
Once filled with chicken drizzle the remaining marinara sauce on top of the stuffed shells and top with mozzarella cheese.
Cover with aluminum foil.
Bake in a 375 degree oven for 30-40 minutes until bubbly.
Serve hot with some french bread and salad for a perfect meal.