Step 1: Preheat your oven to 400°F (200°C) for even cooking.
Step 2: In a large mixing bowl, combine the lean ground beef, finely diced onion, milk, Italian seasoned breadcrumbs, eggs, Worcestershire sauce, and salt. Mix gently to avoid tough meatballs.
Step 3: Form the mixture into meatballs about 1 to 1.5 inches in diameter and place them on a baking sheet lined with parchment paper, spaced apart.
Step 4: Bake the meatballs in the preheated oven for 20-25 minutes until they reach an internal temperature of 160°F (71°C).
Step 5: Let the meatballs rest for a few minutes before serving with spaghetti, in a meatball sub, or as an appetizer.
