Grease a 9 x 13 dish.

Prepare ingredients:

   - 8-12 slices of bread

   - 2 cups cheese, grated

   - 2 cups ham, diced

   - 4 Tbs butter, cut into small pieces

Layer in the dish:

1. However much bread is needed to fully cover the bottom of the dish

2. Half the cheese

3. All the ham

4. Enough bread to fully cover the ham

5. The rest of the cheese

In a large liquid measuring cup, whisk together:

   - 2 cups milk

   - 10 eggs

   - 1/2 tsp mustard

   - 1/2 tsp salt

Pour the egg mixture over the cheese. Dot with butter. Cover with plastic wrap and refrigerate at least 8 hours or overnight.

Allow to sit 30 minutes before baking. Preheat the oven to 350° and remove the plastic wrap.

Bake until puffed up and firm, about 35-45 minutes. Start checking at 30 minutes.