Yes!  This Biscuits and Gravy Egg Casserole is the perfect recipe to put together the night before. To make it beforehand, cook and assemble all the ingredients, cover with plastic wrap and refrigerate.  Since the casserole is being baked, starting at a lower temperature, you will need to add about 20 minutes to the cooking time.  All ovens cook just a bit differently, so you will just need to watch it.  If you find that the breakfast casserole is getting too brown for your taste before cooking all the way through, you can just add a piece of \\"tented\\" foil over the top for the last several minutes to help prevent further browning.