My visiting friend whipped up the ingredients on New Year's Eve and popped it in the fridge for the next morning.
Anne's Overnight Egg Casserole
Other layer ideas- chives or onions, or green chilies....
Heat oven to 350 and bake about 30 minutes, and then check the casserole. Additional bake time will be between 10-15 more minutes. (Cook until puffy and slightly firm.)