Add the bell pepper, tomatoes, onion, garlic, tomato paste, and spices to a blender or food processor and blend until smooth.

Pour the mixture into a pan with a little oil and cook until the excess liquid evaporates. Add the cooked spaghetti along with a little of its cooking water and mix well.

Garnish with chopped parsley and mozzarella cheese if desired.

Serve on its own or with fried or grilled chicken.