Heat olive oil in a large skillet over medium-high heat, add the onion and stir, cooking until soft and nearly translucent then stir in garlic and cook for 30 seconds. Add chicken and cook until just browned.

Then stir in the pasta, tomatoes, chicken broth, lemon juice, water, basil, red pepper flakes, salt and salt and pepper as desired. Bring to a boil and continue to stir often, uncovered, for about 8-10 minutes or until the pasta is tender, add more chicken stock as needed, or until most of the liquid has evaporated. Remove from heat, sprinkle cheese on top, and cover for 10 minutes or until cheese is melted and remaining liquid is absorbed. Serve.