Add spaghetti to greased 13 x 9-inch (33 by 23cm) baking dish. Sprinkle onion, garlic, salt, black pepper and hot pepper flakes over top. Pour in chopped tomatoes, puréed tomatoes and 3 cups (750 mL) water. Drizzle with oil. Using tongs, stir to combine. Cover baking dish tightly with foil.
Bake for 45 to 50 minutes or until pasta has absorbed most of the liquid. Sprinkle with mozzarella and Parmesan.
Bake for 3 to 5 minutes or until pasta is al dente and cheeses have melted. Let rest for 5 minutes before serving. Garnish with basil.
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Tips
Tip: Jazz up pasta with olives, chopped artichokes, diced pepperoni or chopped roasted red pepper slices if desired.