In a skillet, over medium heat, add the olive oil and the onions and saute until onions become translucid;
Add the garlic and the chili flakes and give it a good stir;
Reduce the heat and add the tomatoes, the anchovies and the capers. Simmer for about 10 minutes, until the sauce thickens and the anchovies are incorporated completely;
While the sauce is simmering, cook the pasta in salty boiling water until "al dente". Save one cup of the pasta's starchy water. Drain pasta and return to to pot;
Pour the sauce over the pasta, add the olives, toss well;
Season with some fresh ground black pepper, sprinkle with parsley and serve immediately.
Recipe by Easy Recipes, Etc™ at https://easyrecipesetc.com/spaghetti-alla-puttanesca-recipe/