Cooking is not necessary for overnight oats. I used steel cut myself, but the texture of these oats prepared this way may be chewier than you expect or are used to though, if you have always been heat-cooking them.
Just look up overnight oats and there are plenty of recipes and suggestions, some even using yogurt instead of milk. Here’s one from Martha Stewart for starters,
Cooking is not necessary for overnight oats. I used steel cut myself, but the texture of these oats prepared this way may be chewier than you expect or are used to though, if you have always been heat-cooking them.
Just look up overnight oats and there are plenty of recipes and suggestions, some even using yogurt instead of milk. Here’s one from Martha Stewart for starters,
https://www.marthastewart.com/1524080/no-cook-overnight-oats