01 - Cook pasta in large pot of salted boiling water until al dente per package directions. Reserve 1/2 cup pasta water before draining.
02 - Heat olive oil in large skillet over medium heat. Add onion and cook 3-4 minutes until translucent.
03 - Stir in minced garlic and cook 1 minute until fragrant, being careful not to burn.
04 - Add tomato paste and stir constantly for 1 minute to develop depth of flavor.
05 - Pour in crushed tomatoes, sugar, oregano, and red pepper flakes. Season with salt and pepper. Simmer uncovered 8-10 minutes, stirring occasionally.
06 - Reduce heat to low. Stir in heavy cream and Parmesan cheese. Cook 2 minutes until sauce becomes velvety and combined.
07 - Toss drained pasta into sauce, adding reserved pasta water as needed for desired consistency. Mix until thoroughly coated. Serve hot with fresh basil and additional Parmesan.