Cut the chicken breasts in half so they remain the same length but are half as thick as they used to be (see photos)
Salt and pepper both sides of chicken breasts
When onions have been in the pan for about 6 minutes, move them to the sides of pan, add a little more olive oil if necessary and add breasts to pan, cook first side 6 minutes, still frequently stirring onions, then turn chicken and cook six more minutes (do not overcook, there is nothing worse than dry chicken!)
While second side of chicken cooks, add pasta to boiling water, stirring pasta frequently to prevent sticking
When chicken has cooked for 6 minutes on the second side, check to make sure it is cooked through and remove from pan and allow to 'rest' on a plate (do not turn off heat) . To same pan add nuts, garlic, red pepper flakes, balsamic vinegar and 1/4 cup of pasta water, simmer and stir for one minute scraping any chicken bits from pan
Add two large handfuls of baby arugula (about 3 cups) to pan and stir for a minute or two
Strain pasta (do not rinse) and place in pan, add 1-2 tablespoons olive oil, toss with herbs, nuts and arugula. Season with sea salt and pepper, toss again
To plate: divide pasta onto four plates. Slice chicken breasts on the diagonal and place on top of pasta
Sprinkle with parsley, parmesan and pomegranate seeds.. Serve.