01 -
In a skillet over medium heat, sauté the diced onion, green bell pepper, and sliced mushrooms until softened, about 5 minutes. Allow vegetables to cool slightly before proceeding.
02 -
Using a large mixing bowl, gently combine the ground beef, bread crumbs, egg, milk, Worcestershire sauce, garlic powder, sautéed vegetables, salt, and pepper. Mix until ingredients are just incorporated without overworking.
03 -
Transfer half the meat mixture into a greased loaf pan, pressing gently. Arrange sliced provolone cheese over the layer, then cover with the remaining meat mixture, ensuring the cheese is sealed inside.
04 -
In a small bowl, whisk together beef broth, ketchup, brown sugar, and mustard. Brush half of the glaze evenly over the surface of the assembled loaf.
05 -
Preheat the oven to 175°C. Bake for 45–50 minutes, then brush the remaining glaze over the top and continue baking for the final 10 minutes until cooked through and glazed.
06 -
Allow the loaf to rest in the pan for 10 minutes before slicing. Garnish with freshly chopped parsley if desired and serve warm.