I did a cup of steel cut oats and started getting soft, very quickly (they are significantly more dense than rolled oats). I do half cup.
In a bowl, the night before:
1/2 cup steel cut oats
1 cup milk
1/2 cup Greek yoghurt
Throw it in the fridge. Wake up, stir, add chia seeds and optionally fresh fruit, nuts or other seeds.
This is a brilliant way to eat them instead of cooking (especially in summer)