Step 1

Butter a 9 x 13 baking dish. Tear bread into small pieces and scatter over bottom. Drizzle butter on top.

Step 2

Sprinkle with cheeses and salami.

Step 3

Beat together eggs, milk, wine, onions, mustard and salt and pepper. Pour over cheese and salami. Make sure bread is covered and weight it if necessary. Cover and refrigerate overnight.

Step 4

Remove dish from fridge about 1/2 hour before baking. Preheat oven to Bake covered about 35 minutes. At this point eggs should be just about cooked. If not, leave in oven a bit longer.

Step 5

Uncover and spread with sour cream. Sprinkle Parmesan on top of that. Bake 10 more minutes until crusty and lightly browned. Let sit a few minutes before serving.