01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a large bowl, mix ground beef, egg, breadcrumbs, Parmesan, garlic, parsley, salt, black pepper, and red pepper flakes if using until just combined; avoid overmixing.
03 - Shape the mixture into 1-inch balls and arrange them on the prepared baking sheet.
04 - Bake in the oven for 15 minutes until browned and cooked through.
05 - While meatballs bake, combine tomato sauce, olive oil, honey or brown sugar, Worcestershire sauce, oregano, and garlic powder in a saucepan over medium heat. Simmer for 5 minutes, stirring occasionally.
06 - Transfer the baked meatballs to the saucepan and gently toss to coat. Simmer together for 3 to 5 minutes.
07 - Serve warm with toothpicks and garnish with extra parsley as desired.