Combine all ingredients in a mixing bowl.
Roll beef mixture into 6 even size balls.
Pat/shape into patties, about 2 1/2" round.
Cook burgers your preferred method and to just below your preferred temp. I cooked mine on a cast iron skillet to about medium rare - they will continue to cook a bit when in oven.
Let cool down a little before assembling pizza burger.
To assemble Pizza Burger:
Preheat oven to 400°F. Dust a nonstick cookie sheet with a bit of cornmeal or flour.
On a floured surface, cut pizza dough into 6 even portions. Let dough rest for 10 minutes.
Shape dough into rounds, just about double the size of the burger. Make sure the dough rounds are of even thickness - you don't want the centers too thin. If the dough is springing back too much, let it rest at room temp for a few more minutes. If dough is too sticky, dust hands with flour.
Place cheese (slices or 2-3 tablespoon shredded) in center of dough. Squirt ketchup & mustard on cheese. Place a few pickle or onion slices on next. Finish with burger.
Carefully fold, pinch and pull dough to cover burger and sides. Make sure dough is covering all areas.
Place wrapped burger on cookie sheet, seam side down.
Repeat with remainder of ingredients.
Brush tops with melted butter and sprinkle with garlic powder, parmesan cheese and parsley.
Bake for 14 - 18 minutes until tops are light golden brown.
Let burgers rest for a few minutes, serve & enjoy.