01 -
Pat the diced chicken breasts dry and season evenly with salt, pepper, Italian seasoning, and garlic powder.
02 -
Heat olive oil in a large, heavy-bottomed pot over medium-high heat. Add the chicken pieces and cook for approximately five minutes, stirring frequently, until nearly cooked through but not browned. Remove chicken to a plate to keep warm.
03 -
In the same pot, reduce heat to medium. Add the finely chopped onion and minced garlic, cooking for 2-3 minutes until the onion becomes translucent and the garlic is fragrant, stirring to prevent burning.
04 -
Pour in the marinara sauce followed by 500 milliliters of water (using the empty marinara jar to measure). Stir to combine and raise the heat to bring to a gentle boil.
05 -
Return the chicken to the pot along with the rigatoni pasta. Stir well to coat the pasta and chicken in the sauce. Reduce heat to maintain a strong simmer. Cover and cook for 10-15 minutes, stirring occasionally to prevent sticking, until the pasta is tender.
06 -
Stir in the Parmesan cheese and one quarter of the mozzarella cheese until well blended into the hot pasta mixture.
07 -
Sprinkle the remaining mozzarella cheese evenly over the top, cover the pot, and cook for an additional 2-3 minutes until the cheese is melted and gooey. Finish by garnishing with fresh parsley or basil and, optionally, a sprinkle of additional Italian seasoning before serving.