Name: Mini Meatball Sliders
Prep time: P0Y0M0DT0H30M0.000S
Cook time: P0Y0M0DT0H20M0.000S
Total time: P0Y0M0DT0H50M0.000S
Yield: 24 sliders
Ingredients: 2 pounds ground beef (preferably chuck); 1/2 cup panko or other breadcrumbs; 1/2 cup whole milk; 2 cloves garlic, minced; Kosher salt and freshly ground pepper; 3 tablespoons extra-virgin olive oil; 1/2 onion, diced; 1 24-ounce jar marinara sauce; 24 dinner rolls; 2 cups grated mozzarella cheese

Directions

Combine the beef, breadcrumbs, milk, garlic, 1/2 teaspoon salt, and pepper to taste in a large bowl and knead the mixture together with your hands. Roll into heaping-tablespoon-size balls.
Heat 2 tablespoons olive oil in a large nonstick skillet over medium heat. Add the onion and cook, stirring, until slightly softened, about 2 minutes; remove to a plate. Heat the remaining 1 tablespoon olive oil in the skillet over medium heat. Add the meatballs and cook, turning, until browned all over, about 1 minute. (You might have to do this in 2 batches.)
Pour in the marinara sauce and return the onion to the skillet; gently stir. Cover and simmer 20 minutes.
When ready to serve, split the dinner rolls and sprinkle some mozzarella on the bottom rolls. Top each with a meatball, some sauce and more mozzarella and sandwich with the top rolls.