Step 1: Mix the Meatballs: In a large bowl, combine the ground beef, breadcrumbs, Parmesan, garlic, egg, parsley, oregano, onion powder, red pepper flakes (if using), salt, and black pepper. Mix gently until just combined—don’t overwork the mixture, or the meatballs may become dense.
Step 2: Shape and Sear: Roll the mixture into 1 ½-inch balls and set them aside on a plate. Heat olive oil in a large skillet or Dutch oven over medium heat. Sear the meatballs in batches until browned on all sides. Remove the meatballs and set aside.
Step 3: Make the Sauce: In the same skillet, add a bit more olive oil if needed. Sauté the onions until soft and translucent, about 5 minutes. Add the garlic and cook for another 30 seconds, just until fragrant.
Stir in the crushed tomatoes, tomato sauce, basil, oregano, red pepper flakes, sugar, salt, and black pepper. Bring the sauce to a simmer.
Step 4: Braise the Meatballs: Carefully nestle the meatballs back into the sauce. Reduce the heat to low, cover, and simmer for 30-40 minutes, allowing the meatballs to cook through and absorb all the flavors of the sauce.
Step 5: Serve and Enjoy: Top the meatballs with freshly grated Parmesan and a sprinkle of fresh basil or parsley. Serve them over pasta, with crusty bread for dipping, or on their own as a hearty appetizer.