Horizontally slice each chicken breast right through the centre to create 4 even-sized chicken breasts.
In a small pot or bowl combine Italian seasoning, salt, onion powder, garlic powder and black pepper. Line up 3 large shallow dishes: the first with flour + half of the seasoning mix, the second with beaten egg and the third with Panko breadcrumbs + the rest of the seasoning.
Dredge a piece of chicken through the flour, into the egg then finish in the breadcrumbs, thoroughly coating at each stage. Place on a tray to one side and repeat with the remaining chicken.
Place a large pan over medium-high and add enough oil to cover the base of the pan (6 or so tbsp should suffice). Once the oil is hot (around 3-5 minutes - a breadcrumb should rapidly sizzle) add in two pieces of chicken. Fry for 3-4 minutes on each side until golden and crispy on the outside and white through the centre, then place on a wire rack above a tray or kitchen roll to catch excess oil. Top up the pan with oil and repeat with the remaining chicken, then discard the leftover oil and wipe out the pan. If you can fit all four in at once then do that instead!
Place the pan back over medium heat and melt in the butter. Add the shallots and gently fry until soft and golden, then add in the lemon zest, garlic and 1/2 tsp pepper and fry for another minute or so. Stir in the chicken stock, cream and parmesan, then stir in the juice of the lemon. Bring to a simmer and cook the sauce until it thickens, stirring occasionally.
Meanwhile, add the pasta to salted boiling water and cook until al dente. Check the sauce for seasoning and adjust with salt (season generously to bring out the best in this simple sauce) then use tongs to transfer the pasta straight from the pot into the pan. Add in around 1/4 cup of the leftover pasta water and toss the pasta until the sauce thickens around and clings to it. Add in more pasta water to thin out the sauce if you need to (it will thicken quite quickly).
Serve the pasta next to chicken chicken, or slice the chicken and place on top. Sprinkle over parsley (optional) and enjoy!