Blender Spaghetti Sauce

Nonstick cooking spray
1 small yellow onion, chopped
4 cups chopped vine-ripened fresh tomatoes
    or Roma tomatoes
1 teaspoon dried basil leaves (fresh basil can be
    substituted to taste)
1 teaspoon dried oregano leaves (fresh oregano
    can be substituted to taste)
1/4 cup tomato paste
1 tablespoon olive oil
1 or 2 garlic cloves, minced or pressed
1 1/2 teaspoons granulated sugar
1/4 teaspoon salt (or to taste)
1/4 teaspoon pepper (or to taste)
Cooked tortellini or spaghetti noodles

Heat a large nonstick saucepan over medium-low heat. Coat generously with nonstick cooking spray. Add the chopped onion and saut