You can certainly. You can make the whole recipe in advance and reheat it. You can also assemble all the ingredients ahead of time but bake it later. To do so, add the sliced veggies in the skillet with the cheese and cream mixture, then place it in the fridge until you're ready to bake it, or overnight. Then top it with the additional cheeses and bake it according to directions. Because the skillet will be starting out cold you will need to increase the cook time.