This is what we started with, but oats are so cheap increasing the amoint to add to the creaminess is somewhat inevitable:

3 cups water

1/2 cup rolled oats

2 tsp maple syrup

1/2 tsp vanilla extract

1/8 tsp salt

Blend all ingredients together and pour through mesh strainer into a jar with a tight-fitting lid. Don't push the mushy oats through the strainer or else it will be gritty (but its basically porridge)