Making French Onion Meatballs with Savory Onion Sauce can be seamless if you follow these simplified steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C). Prepare a baking sheet with parchment paper.
2. Prepare the Meatball Mixture: In a large mixing bowl, combine ground beef, ground pork, finely chopped onion, breadcrumbs, egg, Worcestershire sauce, garlic powder, thyme, salt, and pepper. Mix until just combined.
3. Form the Meatballs: Shape the mixture into meatballs, roughly 1 ½ inches in diameter, and place them on the prepared baking sheet.
4. Bake the Meatballs: Bake the meatballs in the preheated oven for about 20-25 minutes or until they are cooked through and slightly browned.
5. Make the Sauce: While the meatballs are baking, heat a saucepan over medium heat. Add the caramelized onions, beef broth, and heavy cream, stirring until well incorporated.
6. Simmer the Sauce: Allow the sauce to simmer on low heat for about 10 minutes so the flavors meld together.
7. Combine Meatballs and Sauce: Once baked, add the meatballs to the saucepan with the sauce, ensuring they are well-coated.
8. Add Cheese: Sprinkle the shredded Gruyère cheese over the meatballs and sauce. Cover with a lid and let the cheese melt for about 5 minutes.
9. Garnish: Remove from heat, and sprinkle with freshly chopped parsley for added color and flavor.

This simple process will guide you to creating an unforgettable meal, blending flavors that remind you of a comforting French onion soup.