Preheat oven to 350 degrees. Brown the ground beef and onion together. Add the seasoning salt and pickles. Set meat aside. In a small bowl mix together the ketchup and mustard.
Spread the ketchup mixture over 1/2 of the sandwich flat. Top with browned meat and sprinkle with cheese.
Place on a parchment lined baking sheet and toast in the oven or toaster oven till the cheese is melted. Remove from the oven and allow the pizza to cool slightly before eating.
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