“My grandma used to make this all the time…”

Preheat oven: Position the oven rack in the lower third of the oven and preheat to 400°F (200°C).
Combine ingredients: In a large bowl, combine the grated onion, chopped parsley, Parmesan cheese, bread crumbs, egg, 2 tablespoons of marinara sauce, minced garlic, red pepper flakes, salt, and pepper. Mix well.
Add ground beef: Add the ground beef to the bowl and mix thoroughly with your hands until evenly combined.
Form meatballs: Shape the meat mixture into 16 meatballs.
Add cheese: Make a small hole in the center of each meatball. Place a cube of mozzarella cheese inside each hole. Reform the meatball around the cheese, ensuring it’s completely enclosed.
Bake: Pour 1/3 cup of marinara sauce into the bottom of a baking dish. Arrange the meatballs in the dish and drizzle with a little extra virgin olive oil.
Bake: Bake in the preheated oven for 15 minutes, or until the meatballs are cooked through.
Enjoy these delicious and cheesy meatballs!