Begin by boiling a large pot of salted water for the pasta.
Cook the pasta according to package instructions until al dente.
While the pasta cooks, heat olive oil in a large skillet over medium heat.
Add the minced garlic and chopped onion, sautéing until translucent.
Stir in the crushed tomatoes and tomato paste, mixing well.
Season with red pepper flakes, salt, and pepper to taste.
Allow the sauce to simmer for 10 minutes, stirring occasionally.
Once the pasta is cooked, reserve some pasta water and drain the rest.
Add the heavy cream to the sauce, stirring until combined and creamy.
Toss the cooked pasta into the sauce, adding reserved pasta water if needed.