Making Slow Cooker Meatball Sliders is easy with these clear steps:

1. Prepare the Meatball Mixture: In a large bowl, combine the ground beef, breadcrumbs, Parmesan cheese, parsley, egg, minced garlic, Italian seasoning, salt, and pepper. Mix until well combined.
2. Form the Meatballs: Shape the mixture into small meatballs, about 1 inch in diameter. You should get approximately 24 meatballs.
3. Place Meatballs in Slow Cooker: Arrange the meatballs in a single layer at the bottom of the slow cooker.
4. Add Marinara Sauce: Pour the marinara sauce over the meatballs, ensuring they are well coated.
5. Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the meatballs are cooked through and tender.
6. Prepare the Sliders: Once the meatballs are ready, preheat your oven to 350°F (175°C).
7. Assemble the Sliders: Place slider buns on a baking sheet. Add two meatballs to each bun, spooning some sauce on top.
8. Add Cheese: Sprinkle shredded mozzarella cheese over the meatballs on each slider.
9. Bake: Place the baking sheet in the oven and bake for about 5-10 minutes, or until the cheese is melted and bubbly.
10. Garnish and Serve: Remove from the oven, garnish with extra parsley if desired, and serve warm.

These steps ensure that your Slow Cooker Meatball Sliders are not only easy to make but also bursting with flavor.