Creating meatball sliders is a straightforward process when you follow these simple steps:

1. Preheat Your Oven: Set it to 375°F (190°C).
2. Make the Meatballs: In a large bowl, combine ground beef, breadcrumbs, Parmesan cheese, parsley, egg, garlic, salt, pepper, and red pepper flakes. Mix until well combined.
3. Form Meatballs: Roll the mixture into about 12-16 meatballs, depending on your desired size.
4. Bake the Meatballs: Place them on a baking sheet lined with parchment paper. Bake for 20-25 minutes, or until they are cooked through and browned.
5. Warm the Sauce: While the meatballs are baking, heat the marinara sauce in a small saucepan over medium heat.
6. Assemble the Sliders: Once the meatballs are cooked, place each meatball on a slider bun. Spoon marinara sauce over the meatballs.
7. Add Cheese: Top each slider with a generous amount of shredded mozzarella cheese.
8. Melt the Cheese: Place the assembled sliders back in the oven for an additional 5-7 minutes, or until the cheese is melted and bubbly.
9. Drizzle with Olive Oil: Remove the sliders from the oven and drizzle a little olive oil on top for added flavor.
10. Serve Warm: Let them cool for a minute before serving.

These steps will guide you in creating incredible meatball sliders effortlessly.