Step 1

Put half the bread in a buttered 9×13 pan.

Step 2

Next add the diced ham, mushrooms, cheese and the rest of the bread.

Step 3

Whip together eggs, milk and mustard. Pour over the bread. Cover the casserole with foil or plastic wrap and store in the fridge overnight.

Step 4

The next morning, sprinkle the corn flakes over the top of the casserole and drizzle the melted butter over the cereal.

Step 5

Bake at 350 for 60 minutes or until the top of the casserole is golden brown.

Step 6

Let the casserole rest for a bit after you take it out of the oven. Serve and enjoy!