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1) Increase the intake of dairy products like milk (full cream), butter, cheese and creamy food items. This will not only be an excellent way to gain weight but will prove to be very healthy for you too.
2) Lower down the intake of vegetables and start on having meaty things like eat eggs and meat; the meat can be chicken, beef, mutton or fish.
3) If you have not been eating deserts or sweet things, start eating them but make sure you are not going for unhealthy stuff.
4) Say YES to snacking and keep snacks that are healthy for you around you at all times. You can have munch nuts, muffins and other things.
5) Go for workouts and exercises that build up muscles so that you can gain weight and look fit at the same time.
Try out the above mentioned simple 5 ways to gain weight fast and you will stay healthy and gain the right amount of weight in no time, only if you are strict enough to follow the weight gain routine mentioned above.
Stay healthy stay happy!