01 - In a large mixing bowl, combine the ground beef, breadcrumbs, Parmesan cheese, egg, minced garlic, milk, salt, pepper, and chopped basil. Gently fold the ingredients together until just incorporated—avoid overmixing to keep the meatballs tender.
02 - Roll the mixture into golf ball–sized portions, yielding approximately 16 meatballs. Place them on a plate or tray as you work.
03 - Heat 2 tbsp of olive oil in a large skillet over medium heat. Arrange the meatballs in the pan and cook, turning frequently, until evenly browned on all sides, about 6 minutes. Transfer to a plate and set aside; they will finish cooking in the sauce.
04 - In the same skillet, add the chopped onion and sauté until softened and translucent, 3 to 4 minutes. Add the garlic and cook for 30 seconds until fragrant.
05 - Pour in the crushed tomatoes and broth. Season with salt, pepper, and sugar if using. Stir to combine and let the sauce simmer gently for 5 minutes to develop flavor.
06 - Stir the heavy cream and 1/4 cup Parmesan cheese into the sauce. Fold in the chopped basil, then nestle the browned meatballs back into the skillet, spooning sauce over the top.
07 - Reduce heat to low and simmer uncovered for 15 to 20 minutes, gently turning the meatballs occasionally, until they are cooked through and the sauce has thickened to a creamy consistency.
08 - Taste the sauce and adjust seasoning as needed. Garnish with fresh basil leaves and serve over pasta, rice, or alongside crusty bread.