1. Preheat the oven to 400°F. Line a baking sheet with foil for easy cleanup and place an oven-safe wire rack on top if using.
Add the ground beef, egg, panko breadcrumbs, Parmesan cheese, Worcestershire sauce, onion, garlic powder, salt, black pepper, and parsley to a large mixing bowl.
Gently mix everything together just until combined. Avoid overmixing. It will make the meatballs tough.
Use a small cookie scoop or spoon to portion the mixture into evenly sized meatballs, then roll gently with your hands. Place the meatballs on the prepared baking sheet, leaving a little space between each one.
Bake for 15-18 minutes, or until the meatballs are cooked through and reach an internal temperature of 165°F.
Serve immediately with pasta, marinara sauce, garlic bread, or use in meatball subs!
Notes
Using 85/15 ground beef helps create juicier, more flavorful meatballs. Leaner ground beef can result in a drier texture.
Finely grated onion adds moisture and flavor without leaving any large onion pieces in the meatballs.
Avoid overmixing the meat mixture. Mix just until combined to help keep the meatballs tender.
A small cookie scoop makes it easy to create evenly sized meatballs, so they cook at the same rate.
For extra browning, place the meatballs on a wire rack set over the baking sheet and lightly spray the tops with cooking spray before baking.
These meatballs freeze well, both cooked and uncooked. See storage instructions below for details. You can freeze cooked meatballs in an airtight container for up to 3 months.