Oat Stuffing

I know I do not usually post recipes, but this one has had me stumped for months. I know I have had a great Scottish oat stuffing, but none of the recipies I saw were "it". Here is what I came up with:

3 C steel cut oats toasted with
2 T butter and
1 diced onion
until onion is tender and oats are nut brown to golden brown

mix 3 stalks diced celery, diced carrots and sliced mushrooms of your choice with oat mixture. Pour in 4-5 cups of rich savory stock (I used turkey stock this time) and 1/2 C milk (because it was left-over from breakfast)
Bake at 400 F in a 9x13 baking pan for about 30 then drop to 350. you can bake the whole thing at 350, i just like a crust and crispy edges.