Heat the avocado oil in a medium saucepan over medium heat. Add the finely diced sweet onion, garlic, and ground red chili flakes. Sauté for 3-4 minutes, stirring frequently, until the onion is soft and translucent. Be careful not to burn the garlic.
3 tbsp avocado oil, ½ medium sweet onion, 3 cloves garlic, ½ tsp ground red chili flakes
While the onion mixture is cooking, pour both cans of crushed tomatoes into a food processor. Pulse 7-8 times, or until the tomatoes reach your desired consistency. Then, add the crushed tomatoes to the saucepan and stir to combine.
2 14.5 oz cans of crushed tomatoes
Stir in the tomato paste, oregano, basil, sugar, garlic powder, and onion powder until well combined. Cook the sauce for 3-4 minutes on medium-low heat, stirring frequently.
¼ cup tomato paste, 1½ tsp dried oregano, 1 tsp dried basil, 1 tbsp granulated sugar, ¼ tsp garlic powder, ¼ tsp onion powder
Pour in 2 cups of water and bring the sauce to a gentle simmer. Reduce the heat to low/medium-low. Cover the sauce and allow it to cook for 25-30 minutes, stirring occasionally.
2 cups water
Once the sauce has been cooking for about 15 minutes, bring a large pot of salted water to a boil.
1 tbsp salt
Once the water is boiling, add the fettuccine and cook according to package instructions (my favorite takes around 13-14 minutes).
1 box fettuccine (16 oz)
While the pasta is cooking, add the heavy cream and parmesan cheese to the arrabbiata sauce. Stir well. Make sure your heat is turned all the way down to low so as to not scorch the cream.
1 cup heavy cream, 1 cup Parmesan cheese
Drain the fettuccine and immediately pour it into the creamy arrabbiata sauce. Stir well to coat the pasta evenly. Serve right away.
Optional—Chiffonade a few leaves of fresh basil for a pop of flavor and color! (Chiffonade is just a fancy term for rolling up the leaves of basil and cutting them into really thin pieces or shreds.)
Fresh basil