Now, let’s get to the fun part—cooking! Here’s how you can create these flavor-packed meatballs:

1. Preheat your oven to 400°F (200°C).
2. In a large bowl, combine the ground beef, breadcrumbs, Parmesan cheese, egg, garlic powder, salt, and pepper. Mix until just combined—overmixing can make the meatballs tough.
3. Form the mixture into small balls, about 1 inch in diameter, and place them on a baking sheet lined with parchment paper.
4. Bake the meatballs in the preheated oven for 15 minutes, or until they’re browned and cooked through.
5. While the meatballs are baking, heat the olive oil in a large skillet over medium heat. Add the sliced onions and cook until they’re caramelized and golden brown, about 15-20 minutes. Stir frequently to prevent burning.
6. Once the onions are caramelized, add the beef broth and Worcestershire sauce to the skillet. Bring to a simmer and let the flavors meld for about 5 minutes.
7. Add the baked meatballs to the skillet, tossing them gently to coat with the onion mixture.
8. Sprinkle the shredded Gruyère cheese over the top and cover the skillet until the cheese has melted, about 3-4 minutes.
9. Garnish with fresh parsley, if desired, and serve warm.

There you have it! A delightful dish that’s as enjoyable to make as it is to eat. Plus, the aroma filling your kitchen is just glorious.