Meatball-Stuffed Garlic Bread Sliders

Ingredients 2 tablespoons olive oil, divided 1 yellow onion, diced 5 cloves garlic, minced, divided 1 pound ground beef 2 tablespoons chopped Italian parsley, plus more for garnish 1 large egg 1/4 cup plain bread crumbs 1 cup shredded fontina cheese, divided 2 teaspoons kosher salt freshly ground black pepper to taste 1 pinch cayenne … Read more