Pre-Prep - Start by gathering all your ingredients and prepping them. Finely chop the garlic and onion, measure out the tomato paste, cream, and other seasonings. Having everything ready makes the cooking process smooth and enjoyable.
Making the Sauce - Heat the olive oil in a large pan over medium heat. Add the chopped garlic and onion, sautéing until they're soft and translucent. Stir in the tomato paste, cooking it for a few minutes to deepen its flavor. Add the red chili flakes, dried oregano, and a pinch of salt and sugar. Pour in the vodka (if using) and let it simmer for a couple of minutes to cook off the alcohol. Then, add the cream, stirring until the sauce is smooth and well combined. Stir in the Parmesan cheese and butter, mixing until the cheese has melted and the sauce is glossy.
Cooking the Pasta - While the sauce is simmering, bring a large pot of salted water to a boil. Add the pasta and cook according to the package instructions until al dente. Reserve a cup of the pasta water before draining.
Combining Everything - Add the cooked pasta to the sauce, tossing to coat it evenly. If the sauce is too thick, add a bit of the reserved pasta water to reach your desired consistency. Sprinkle with dried parsley before serving.