Preheat the oven to 400 degrees F and line a baking sheet with parchment paper.
Add ground beef, onion, bread crumbs, milk, and Parmesan cheese to a large mixing bowl.
Add Worcestershire sauce, Italian seasoning, oregano, red pepper flakes, sea salt, garlic salt, and hot pepper sauce to the bowl.
Mix all ingredients until evenly combined.
Shape the mixture into 12 meatballs.
Place the meatballs onto the prepared baking sheet.
Bake for 20 to 25 minutes until the meatballs are no longer pink in the center.
Notes
Tips and Tricks
Use a Small Scoop - A small cookie scoop or ice cream scoop helps you make evenly sized meatballs. This ensures they cook at the same rate.Don't Overmix - Mix the ingredients until just combined. Overmixing can make the meatballs tough.Line the Baking Sheet - Parchment paper or a silicone mat makes cleanup easier and prevents sticking.Check the Temperature - Use a meat thermometer to make sure the internal temperature reaches 160 degrees F. This ensures the meatballs are fully cooked.Add More Spice - If you like heat, increase the red pepper flakes or add extra hot pepper sauce.Make Them Ahead - Form the meatballs and refrigerate them for up to 24 hours before baking. This saves time on busy days.
Storing and Reheating
Refrigerate - Store cooked meatballs in an airtight container in the refrigerator for up to 4 days.Freeze - Place cooled meatballs in a freezer-safe container or bag. Freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.Reheat in Oven - Place meatballs on a baking sheet and warm in a 350 degrees F oven for 10 to 15 minutes until heated through.Reheat in Microwave - Place a serving on a microwave-safe plate. Heat on high for 1 to 2 minutes, checking halfway through.Reheat on Stovetop - Place meatballs in a skillet with 2 to 3 tablespoons of marinara sauce or water. Warm over medium heat, stirring occasionally, until heated through.