Ingredients 5 Tablespoons Butter 2 Medium Yellow Onions, Thinly Sliced 1 Large Egg 2 Tablespoons Worcestershire Sauce Divided 2 1/4 Cups Beef Broth, Divided 1 1/2 Pounds Lean Ground Beef 1/3 Cup Panko Breadcrumbs 2 teaspoons Italian Seasoning 2 teaspoons garlic powder Salt & Pepper, To Taste 1/3 Cup Flour 8 Slices Provolone Cheese 1/2 Cup Shredded Parmesan Cheese Instructions Melt the butter in a large skillet over medium-high heat. Add the sliced onions, one Tablespoon of Worcestershire sauce, and 1/4…