Is there any way we can make it without it becoming sticky?
50% RH does not sound so bad actually.
In a hot-humid climate, chilling the food will only exacerbate the problem of condensation.
There are a few options. Put them into an air tight container with some food grade silica gel desiccant. Alternatively, a bowl of salt (you can pre-heat the salt slightly) will do a similar job.
Use a food dehydrator, but you will still have a wetting/sticky problem during storage.