Meanwhile, put the olive oil in a medium saute pan over medium heat. Add the chicken and cook for 3 minutes. Add the onions and garlic, stirring to combine, and cook until the onions are soft and the chicken is cooked through, about 5 minutes more. Put the chicken mixture into the bowl with the cooked pasta. Add the canned tomatoes, mozzarella cheese, parsley, salt, and pepper. Stir to combine. Place the mixture in a buttered 8 by 8 by 2-inch baking dish.
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