Pasta with Tomatoes, Mixed Peppers, Onions and Garlic   Ingredients: 2 tablespoons extra-virgin olive oil, plus more for drizzling 1 large red onion, finely chopped 5 garlic cloves, minced 1 pound mixed bell peppers, finely chopped Kosher salt Pepper 1 pound spaghetti 1 cup Roma tomatoes, diced 1/4 cup Italian (flat-leaf) parsley, chopped Shaved