01 - 
                Heat a skillet over medium heat and cook ground beef with Italian sausage until fully browned. Drain excess fat and set aside.
              
              
              
                02 - 
                Preheat oven to 220°C.
              
              
              
                03 - 
                Roll out one pie crust and fit onto a deep-dish pie pan or deep skillet.
              
              
              
                04 - 
                Distribute half of the shredded mozzarella on the bottom crust. Top evenly with the cooked beef, Italian sausage, and half the pepperoni slices.
              
              
              
                05 - 
                Pour pizza sauce or marinara evenly over the meat. Sprinkle with Italian seasoning, garlic powder, and red pepper flakes.
              
              
              
                06 - 
                Cover with the remaining mozzarella and cheddar or provolone. Add remaining pepperoni slices over the top.
              
              
              
                07 - 
                Place the second crust over filling, sealing edges. Brush the top with melted butter.
              
              
              
                08 - 
                Bake in the preheated oven for 20-25 minutes until the crust turns golden brown and cheese bubbles.
              
              
              
                09 - 
                Let pie rest for several minutes before slicing and serving.