Here is a pizza burger and how I did it.

Bun
1/4 Pound hamburger patty
Pizza sauce
Mozzarella cheese
Olilve oil
Salt/Pepper
Crushed red pepper
Oregino
Garlic powder
Parsley
Basil
Or spice to taste
In a small pan grill bun remove and set aside.
Add enough olive oil to coat pan.
Add burger and season. (Watch for Flames)
Grill both sides
Add pizza sauce and mozzarella cheese.
Cover to let cheese melt.
Remove patty, put on bun and enjoy.
Tips: Let the cheese fall on the pan and burn.
Will add a nice crunch and flavor to the burger.
Let flames burn burger while cooking. (Pleae be careful doing this)
Condiment to taste. (You reall dont need them)
You may also try your favorite pizza toppings on top.