At least an hour before cooking, pour the beer into a shallow bowl to sit until it becomes flat. Dry the bread cubes on a baking sheet in a 300° F oven until crisp but not browned (probably 15 minutes).
Lightly coat a 2 quart casserole dish with non-stick spray. Preheat oven to 350° F. In a large non-stick skillet, steam/sauté cualiflower with the caraway seeds and 2 Tbsp water until barely tender.
In a large bowl, combine bread cubes and cauliflower. Spread in the prepared casserole dish.
In a large bowl, whisk together the egg equivalent, nutritional yeast, mustard, coriander, pepper, and flat beer. Pour the liquid over the bread and cauliflower in the casserole dish.
Bake for 30 to 45 minutes, until puffed and golden.
Servings: 4