Add ingredients to a glass bowl then stir to combine and set aside. Can be made a day ahead of time.
Bring a large pot of water to a boil then salt heavily and add spaghetti. Cook until al dente then drain and set aside.
Meanwhile, heat a large skillet over medium-high heat then mist or spray with extra virgin olive oil or nonstick spray. Season chicken on both sides with Italian seasoning, garlic salt, and pepper to taste then saute for 2-3 minutes per side or until cooked through. Remove to a plate then tent loosely with foil and set aside. Remove skillet from heat to cool slightly.
Return skillet to the stovetop over medium heat. Add bruschetta mixture and simmer for 2-3 minutes or until tomatoes are heated through and juices are slightly thickened. Add pasta and parmesan cheese then toss to combine. Taste then add salt if necessary. Scoop into bowls then top with more parmesan cheese, balsamic reduction if using, and chicken, then serve.