Post workout meal
Oats has a lot of fibre which helps in reducing the fat in your body.
When your aim is to gain weight and if you havent burnt enough calories in your workout,they get stored in your body as fats.
So good amount of cardio and high fibre diet is also suggested post workout.
Oats also help in reducing the cholestrol level of your body so they are good for your heart.
An oatmeal made of milk and oats also has a decent amount of proteins in it which helps in building muscle.
So i say yes,oats is a very good option for your post workout meal.