Cook tater tots according to package directions. Remove from oven and let cool slightly. Preheat oven to 375. Evenly spread tater tots out in a layer in a cast iron skillet, then top with shredded cheese. Heat in oven for 5-10 minutes or until cheese is melted. Carefully remove from oven, top with additional desired toppings like sour cream, green onions, diced tomatoes and onions, and serve.