Creating Cheesy French Onion Meatballs is simple if you follow these steps:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C). This ensures your meatballs cook evenly.
2. Prepare Onions: In a skillet, heat olive oil and butter over medium heat. Add the chopped onions and cook until they’re caramelized, about 10-12 minutes. Stir occasionally.
3. Mix Meatball Ingredients: In a large bowl, combine ground beef, cooked onions, shredded cheese, breadcrumbs, parsley, minced garlic, Worcestershire sauce, egg, salt, and pepper. Mix until just combined.
4. Shape Meatballs: Form the mixture into meatballs about the size of a golf ball, arranging them on a baking sheet lined with parchment paper.
5. Add Cheese to Middle: For an extra cheesy surprise, make an indentation in each meatball and place a small cube of cheese inside before sealing it back up.
6. Bake: Place the meatballs in the preheated oven and bake for 20-25 minutes or until they are cooked through and golden brown.
7. Top with Cheese: During the last 5 minutes of baking, sprinkle some additional cheese on top of the meatballs for that gooey finish.
8. Rest: Remove from the oven and let them rest for a few minutes before serving. This helps the flavors meld together nicely.

By following these steps, you will create a tray full of these delectable meatballs that are sure to be a hit!