I revisited this recipe since the first batch of oatmilk was only OK. This one turned out much better. I used rolled oats instead of steal cut. I also strained it twice. It was much less starchy. I am not sure how much healthier the steel cut oat milk is so let me know if you think it's worth it to make the other instead.
1 cup rolled oats (not instant oats)
3 cups water
I soaked the oats for 20 minutes, much less than the steel cut oats. Rinsed them in a colander.
Then put them in the vitamix with water and blended until smooth. Strained and repeated. Viola!