Creating French Onion Meatball Sliders is easy when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Make the Meatballs: In a large bowl, combine ground beef, breadcrumbs, Parmesan cheese, egg, garlic powder, onion powder, salt, and black pepper. Mix until just combined, then form into small meatballs (about 1 inch in diameter).
3. Cook the Meatballs: In a large skillet, heat olive oil over medium heat. Add the meatballs and brown them on all sides, about 5-7 minutes. Remove and set aside.
4. Caramelize the Onions: In the same skillet, add the sliced onions. Cook on medium-low heat, stirring occasionally, until they are soft and caramelized, about 15-20 minutes.
5. Add Broth and Seasoning: Once the onions are caramelized, add beef broth, Worcestershire sauce, and thyme. Stir and let it simmer for about 5 minutes until slightly thickened.
6. Combine Meatballs with Onion Mixture: Return the meatballs to the skillet, coating them with the onion mixture. Allow them to simmer together for an additional 5 minutes.
7. Assemble the Sliders: On the bottom half of each slider roll, place a meatball and top it with a generous amount of the onion mixture. Sprinkle shredded cheese over the top, then place the top half of the roll on each slider.
8. Bake in Oven: Place the assembled sliders on a baking sheet and bake for 10-15 minutes, or until the cheese is melted and the rolls are lightly toasted.
9. Garnish and Serve: Remove from the oven and sprinkle with fresh parsley if desired. Serve warm.

These simple steps will guide you in creating these delicious sliders that are sure to impress!