Dry seasoned popcorn in oven
Yes, oven drying is fine. Depending on how much liquid is on the popcorn, 15-30 minutes at 300 F should work. Mix the popcorn around a couple of times during this process.

Keep in mind that hot popcorn will seem soggier than it will be once it cools. When checking for doneness, let a piece cool for a little while before testing it.