01 - 
                Bring a large pot of salted water to a boil. Add the jumbo pasta shells and cook until al dente, about 8-10 minutes. Drain and set aside to cool.
              
              
              
                02 - 
                In a large skillet, heat the olive oil over medium heat. Add the onions, green bell pepper, and mushrooms. Sauté for 4-5 minutes until the vegetables are tender.
              
              
              
                03 - 
                Add the ground beef or sliced steak and cook until browned. Stir in the minced garlic, salt, pepper, and Worcestershire sauce. Cook for another 2 minutes. Remove from heat and let cool slightly.
              
              
              
                04 - 
                Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish.
              
              
              
                05 - 
                Spoon 1-2 tablespoons of the beef mixture into each cooked pasta shell. Place the stuffed shells in the prepared baking dish.
              
              
              
                06 - 
                Sprinkle half of the shredded cheese over the stuffed shells. Pour the Alfredo sauce evenly over the shells, then top with the remaining cheese and Parmesan.
              
              
              
                07 - 
                Sprinkle with Italian seasoning for extra flavor.
              
              
              
                08 - 
                Cover the baking dish with aluminum foil and bake in the preheated oven for 20 minutes.
              
              
              
                09 - 
                Remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
              
              
              
                10 - 
                Let the stuffed shells cool for 5 minutes before serving.