I like to make hot "horsey" oatmeal on the occasional cold morning for Indie, she seems to appreciate it.
Your desired amount of oats (I just throw in the quick whole grain oats from the cupboard) in the feed pan.
Drizzle some molasses
(For the veggie and fruit part, I like to mix and match.)
Chop up a couple carrots.
Two apples worth of apple slices
Cup of corn (Though not desirable for all horses,)
I personally like to go ahead and add her ACV and corn oil, the two things in her food every feeding anyways.
Then I boil some water and pour in just enough to soak, let it cool enough so it doesn't burn (though it's that way by the time I make it to the barn LOL), and serve. :)