Basically you need to eat more calories than you burn. Seeds and nuts are very in calories and good heart healthy fats.
Just remember not to eat junk, good healthy balanced diet...but just more quantity.
Bananas are good for putting on weight as is peanut butter. And both are still healthy.
(although, OP, I don't think 105 5'2" is terribly under weight) At 19 I was 5'5" and 105. Now I'm 5'6" and 115 and perfectly healthy.
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