Au Gratin Potatoes, Ham & Broccoli Casserole

For this recipe I use two boxes of store bought au gratin potatoes, a bag of frozen broccoli and a ham steak that I’ve diced.  I mix everything together in a casserole pan and bake for 45 minutes at 450 degrees.  The boxes of au gratin potatoes call for a lot of water, milk and butter.  I only use what is called for using one box plus a 1/2 cup of milk because the ham and broccoli give off some much of their own water while cooking.  The first time I made this I used the amounts called for and we ended up with a very soupy casserole.