Chicago Pizza Burger

1 lb lean ground beef    
Sandwich buns    
1 c (1/4 pound) chopped pepperoni    
Sliced mozzarella cheese    
1/3 c grated Parmesan cheese    
Sliced tomato    
2 t pizza seasoning mix (garlic, oregano, basil)
   
Mix together beef, pepperoni, Parmesan cheese and seasoning mix; 
form into 4 patties. 
Grill to desired doneness.
Serve burgers in sandwich buns with mozzarella cheese, 
tomato and  ketchup.