Prepare penne rigate pasta in large sauce pot according to directions on packaging.
While penne cooks, add two tablespoons extra virgin olive oil to large cast-iron pan and bring to medium-high heat.
Once pan is hot, add chicken and sear until golden brown, about three minutes, then flip and sear again on other side.
When chicken has reached 165 degrees Fahrenheit, remove from pan, slice into strips, and set aside for plating.
Add marinara sauce to large saucepan and heat.
Drain pasta and add to pan with sauce, combine until well incorporated, and stir until both are heated thoroughly.
To plate, divide sauced pasta equally between 4 bowls, top each bowl with chicken slices, and then sprinkle with grated Parmesan and minced Italian parsley.