01 - Bring a large pot of generously salted water to a rolling boil. Cook the pasta according to package directions until al dente, then reserve 1/2 cup of the starchy cooking water before draining.
02 - Heat olive oil in a large skillet over medium heat. Add the chopped onion and cook for 3 to 4 minutes until translucent and softened.
03 - Stir in the minced garlic and cook for 1 minute until fragrant, being careful not to let it brown or burn.
04 - Add the tomato paste and stir continuously for 1 minute to deepen its flavor and caramelize slightly.
05 - Pour in the crushed tomatoes along with sugar, dried oregano, and red pepper flakes. Season with salt and pepper. Simmer uncovered over medium-low heat for 8 to 10 minutes, stirring occasionally until slightly thickened.
06 - Reduce heat to low. Stir in the heavy cream and grated Parmesan cheese. Cook for 2 minutes, allowing the cheese to melt completely and the sauce to become silky and smooth.
07 - Add the drained pasta directly into the skillet. Toss thoroughly to coat every piece, adding the reserved pasta water a little at a time as needed to achieve a velvety, clinging consistency.
08 - Plate the pasta immediately while hot. Top with torn fresh basil leaves and a generous sprinkle of extra Parmesan cheese.