If you make the filling in an oven safe skillet, including a Dutch oven or a large cast iron skillet, you can add the cheese and tater tots and bake it in the same pan. You can also transfer the filling into any sized baking dishes that it will fit in. If feeding a smaller family, you could use 2 small pans and freeze one for later. Depending on the size dish you use, you may end up with a thinner layer of filling and using the whole bag of tater tots, or a thicker layer of filling and having some left over. If your baking dish is very full, you may want to add a sheet pan to the oven under your dish to catch any bubble over.