Creating delicious meatball sliders is simple. Just follow these steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Mix Meatball Ingredients: In a large bowl, combine the ground beef, breadcrumbs, Parmesan cheese, parsley, egg, minced garlic, Italian seasoning, salt, and pepper. Mix until well combined.
3. Form Meatballs: Shape the mixture into small meatballs, about 1 inch in diameter. You should have around 16 meatballs.
4. Bake Meatballs: Place the meatballs on a baking sheet lined with parchment paper. Bake in the preheated oven for 20-25 minutes, or until they are cooked through and browned.
5. Warm Marinara Sauce: While the meatballs are baking, heat the marinara sauce in a saucepan over medium heat until warmed through.
6. Assemble Sliders: Once the meatballs are done, place them in the slider buns. Spoon some marinara sauce over each meatball, then sprinkle with shredded mozzarella cheese.
7. Melt Cheese: Return the assembled sliders to the oven for an additional 5 minutes, or until the cheese is melted and bubbly.
8. Drizzle with Olive Oil: Remove from the oven and drizzle a little olive oil on top of the sliders for extra flavor.
9. Serve: Serve the sliders warm, with extra marinara sauce on the side for dipping.

These steps will guide you through making mouthwatering meatball sliders that everyone will love.