01 - Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper and set aside.
02 - In a large mixing bowl, combine ground beef, breadcrumbs, Parmesan, milk, egg, garlic, parsley, oregano, salt, and pepper. Mix gently until just incorporated—overworking the mixture will make the meatballs dense. Roll into 16 to 18 uniform meatballs and arrange on the prepared baking sheet.
03 - Bake for 15 to 18 minutes, until golden brown on the outside and cooked through to an internal temperature of 165°F.
04 - While the meatballs bake, heat olive oil in a large skillet over medium heat. Add the diced onion and sauté until softened and translucent, about 3 minutes. Add the garlic and cook for 1 additional minute until fragrant.
05 - Pour in the crushed tomatoes, broth, sugar, salt, and pepper. Stir to combine and bring to a gentle simmer. Cook for 7 to 8 minutes, allowing the sauce to reduce slightly and the flavors to develop.
06 - Reduce heat to low. Stir in the heavy cream until the sauce is smooth and uniformly colored. Fold in the chopped basil and let simmer for 2 more minutes.
07 - Transfer the baked meatballs into the skillet, nestling them into the sauce. Spoon sauce over the top and cook for 5 minutes, allowing the meatballs to absorb flavor and heat through completely.
08 - Serve hot, garnished with additional fresh basil leaves. Pair with pasta, steamed rice, or crusty bread for a complete meal.