Turn on oven to 350 F. (for the bread a little later).
On stove top heat 2 tablespoons of butter in a medium size pan on high heat.
Season the chicken with salt & pepper and add to the pan. Cook for about 4 mins per side to make sure each side is browned.
In a medium stock pot add chicken and juices from pan. Add the marinara sauce to ensure chicken is mostly covered in sauce. Put cover on pot.
Bring pot to a simmer and cook for about 35 minutes. About ½ way through cooking flip breast to other side to ensure even cooking. Can pull chicken out when the temp hits 160 F as it will continue to rise to 165 degrees.
After chicken has been cooking for about 20 minutes, wrap loaf of bread in foil. Heat for about 15 minutes.
After chicken has been cooking for about 25 mins, start boiling water for pasta.
Cook pasta according to directions on package (usually only about 3-5 mins).
In individual serving bowls plate pasta first then put 1 chicken breast on top and add sauce to your liking.
Add shredded parmesan or Romano cheese and serve.