1. Preheat the oven to 375*
2. Place the pizza Dough in the cast iron skillet
3. Press the dough on the bottom and up the sides slightly
4. In a large skillet on medium high heat, crumble and brown the ground beef, add the onions and season with salt and pepper
5. Drain the grease after the meat is done frying
6. Combine the mustard and ketchup in a small bowl
7. Pour the mixture on the pizza crust and spread evenly
8. Sprinkle the mixture with some of the cheese
9. Top with the beef and onions on top
10. Top with the remaining half of the Cheddar Cheese
11. Place in the preheated oven and bake for 20 minutes
12. When done top with lettuce, pickles, and tomatoes, and any other toppings you would like