Cut each breast in half crosswise. Then take the thicker half and cut it in half lengthwise. This will produce three pieces of about the same size and thickness.
Lay out the pieces on the cutting board and cover them with plastic wrap. Lightly pound them to make them all uniformly flat.
Sprinkle the chicken with the kosher salt and black pepper. Set it aside while you prep the rest of the ingredients.
Once you are ready to cook, heat a large skillet over medium high heat. When the pan is hot, add 2 tablespoons of olive oil and then the chicken pieces.
Cook the chicken for 2-3 minutes on the first side and then 2-3 minutes on the second side, or until browned on both sides and cooked through. Remove to a bowl.
Slice the chicken against the grain into bite sized pieces.
Rinse out the skillet and wipe it down.
Reduce the heat to medium. Once the pan is hot add the tablespoon of olive oil and the pancetta or bacon. Saute for 4-5 minutes. Then add the onion and saute for another 4-5 minutes. Add the garlic and pepper flakes and saute for 1 minute.
Add the wine and bring to boil. Cook for about 1 minute, or until reduced by half.
Add the water and cream. Increase the heat to high and bring to a boil.
Once the liquid is boiling, add the pasta and reduce the heat to medium. Turn the pasta over a couple of times to get it all soaked then cover the skillet and let cook for a minute.
After a minute you should be able to stir the fettuccine into the sauce. Cover again and cook for 2 minutes.
Take the cover off and continue cooking the pasta while reducing the sauce. Stir as needed. If the sauce reduces too much, add a little more water.
Once the pasta is cooked through, take the skillet off the heat and stir in the parmesan. Then stir in the chicken, tomatoes, and fresh herbs. Rewarm the pasta over the hot burner if needed. Serve with extra parmesan at the table.