In a large bowl, mix ground beef, pork, breadcrumbs, egg, garlic, onion, Parmesan cheese, Italian seasoning, red pepper flakes (if using), salt, and pepper until just combined.

Roll the mixture into 1.5-inch meatballs and set them aside.

Heat olive oil in a skillet over medium heat. Sear meatballs until golden brown on all sides, about 6-8 minutes.

In the same skillet, add more oil if necessary, and stir in the tomato paste. Cook for 1–2 minutes.

Pour in the crushed tomatoes, then stir in heavy cream and additional Parmesan. Let it simmer for about 5-7 minutes.

Return the seared meatballs to the skillet. Cover and simmer on low heat for 15–20 minutes.

Garnish with fresh basil or parsley right before serving.