Preheat oven to 375 degrees F. Place one pizza crust on a sheet pan. Add half of the marinara sauce, beef, and cheese slices.
Top with the other pizza crust. Spread remaining marinara sauce. Top with sliced tomatoes, onions, and mozzarella cheese. Bake for 20-25 minutes or until cheese is bubbly!
Top with all of your favorite cheeseburger toppings! We did romaine lettuce, pickles, ketchup, and mustard.