In a large bowl, stir together the breadcrumbs and milk. Set it aside for about 10 minutes so that the breadcrumbs can soak up the milk and soften.
¾ cup panko breadcrumbs, ⅓ cup whole milk
While that is sitting, prep the rest of your ingredients (i.e. shred the cheese, mince the herbs, and grate the onion). After the 10 minutes is up, add both meats to the breadcrumb mixture. Then add all the remaining ingredients, sprinkling everything evenly across the top to make mixing more even.
1 pound ground beef, 1 pound ground pork, 2 eggs, 1 oz (about ½ cup) parmesan cheese, 3 tablespoon fresh basil or parsley, 2 oz (about ¼ cup) yellow onion, 1 tablespoon garlic, 2 teaspoon worcestershire sauce, 1 teaspoon kosher salt, ½ teaspoon pepper
Use clean hands to mix everything together until evenly combined, being careful not to overmix so that they don't become tough.
Preheat the oven to 425 degrees Fahrenheit, then line two cookie sheets with parchment paper. Use a 2 tablespoon cookie scoop to form the meatballs and place them on the prepared sheets at least 1-2 inches apart. If you want them extra round, you can roll them in your palms before placing them on the sheet.
Bake the meatballs for 10 minutes on the middle rack of your oven. Then turn the broiler on high and place them 6-8 inches below the broiler. Broil for 4-5 minutes until the tops are golden brown and an instant thermometer reads 165°F when inserted in the middle of several meatballs.
Remove from the oven and serve with marinara sauce over pasta!
For serving: Marinara sauce, pasta, and parmesan cheese