Preheat oven to 350"F.
Heat up the olive oil in a cast iron skillet. Season each side of the chicken fillets with a good pinch of the sea salt and black pepper all over.
Mix the parmigiano reggiano cheese and the panko bread crumbs together. Dredge the chicken tenderloin in the egg and then the bread crumb mixture, coating evenly. Shake any excess and cook in the olive oil until golden brown, about 2 minutes on each side.
Spoon some of the tomato arrabiata sauce on the bottom of baking sheet and transfer the cooked chicken on top. Spoon some of the arrabiata sauce on top of the chicken and sprinkle with the cheese.
Loosely cover with aluminum foil and place in the preheated oven for a few minutes until the cheese has melted.
Meanwhile bring a pot of water to a boil, salt it generously and cook the noodles according to the instructions on the package. If you made your own fresh pasta, about 3 minutes.
Alternatively, you can heat up the oven to broiler and transfer the chicken to a broiler proof tray. Sprinkle with half of the mozzarella and spoon some of the marinara sauce on top. Sprinkle with the rest of the mozzarella and broil until the cheese has melted. About 3 minutes or so, depending on how close you have it to the flame.
Meanwhile prepare the Alfredo sauce:
To make the Alfredo sauce, heat up the cream in a sauce pan over medium flame. Once it starts to simmer start adding the parmigiano reggianno cheese a little bit at a time, whisking constantly until the sauce starts to thicken. (about 5 minutes)
Once the sauce has thickened remove from flame and whisk in the cold butter and nutmeg. Toss with the fettuccine and serve with freshly cracked black pepper on top next to the chicken parmigiana.