1. Steam and cool the potatoes, put them in the fresh-keeping bag, crush them with a rolling pin and stir them into mud;
2. Slide butter in the pot, add diced carrot and corn, stir fry, then add diced shrimp, diced ham and salt;
3. Add black pepper to the stir fried raw materials, put them into the fresh-keeping bag with mashed potatoes, mix and stir, and then turn all the ingredients upside down to the pizza plate and smooth;
4. Rub the mozzarella cheese and evenly spread it on the pizza plate filled with all materials;
5. Place the oven 180 degrees, heat up and down for about 15 minutes.