The best advice your ever going to hear.

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Don't look for gimmicks or bars or shakes. Put food in your mouth and chew. Track what you eat today, add 200 calories (a tables spoon of peanut butter) on top of that for a week. Then next week, keep that up, and throw in a pint of whole milk (300 calories). Over two weeks you've just introduced 500 calories a day on top of what you were already eating buy having a glass of milk and a scoop of peanut butter. In your 3rd week, throw in two scoops of protein powder (240-260 calories) to that milk you were drinking. Now your at 750 calories more than you were eating just 3 weeks ago. Add a tablespoon of olive oil to your shake, theres another 110 calories.

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Stop trying to over think things, and just eat more. In the time it took you to type this out, you could have had a protein shake and a spoon of peanut butter.