Panko-coated hen-of-the-woods mushrooms sub in for the typical eggplant in this cheesy, tomato-y casserole. The sauce can be made a day ahead and stored in an airtight container in the refrigerator.
Add this mixture to the baked baguette and combine thoroughly before tipping into the buttered baking dish. In a jug, whisk the eggs with the cold stock, then pour it over the bread mix.
Mix together the eggs, flour and a pinch of salt ... can be frozen and reheated if you need to get ahead on your roast dinner. Just make sure to use them within 3 months.