In a large bowl, combine ground beef, salt, pepper, onion powder, garlic, parsley, egg, Parmesan cheese, and bread crumbs. Mix lightly until well combined. Shape into 12 meatballs.
1 pound lean ground beef, Salt and pepper to taste, 2 teaspoons onion powder, 1 clove garlic, 1 tablespoon Parsley flakes, 1 tablespoon Fresh parsley, 1 egg, ½ cup breadcrumbs, ½ cup Parmesan cheese
Grease a heavy skillet and bring to medium-high heat. Cook the meatballs until they are browned on all sides.
Without separating the rolls, use a serrated knife to cut them in half horizontally. Place the bottom half of the rolls in a 9x13-inch pan. Spread ½ cup of marinara sauce over the buns.
2 cups marinara sauce, 12 pack Hawaiian rolls or slider buns
Place a meatball on each slider. Spoon another ½ cup of sauce over the meatballs, reserving the remaining sauce for dipping. Layer the slices of cheese on top, then place the top half of the buns on top.
12 mozzarella cheese slices
Brush the top of the sliders with melted butter and sprinkle with grated Parmesan, Italian seasoning and parsley.
Bake in the air fryer at 350°F (180°C) uncovered for 8 minutes or until the cheese is melted and the buns are golden brown.
2 tablespoons unsalted butter, 1-2 tablespoons grated parmesan cheese
Serve warm and enjoy!