Hi Danielle,
You might want to try the peanut butter cookies yourself before you test them out on non-low carbing party guests. They aren't bad, but they are definitely not like real PB cookies in
my opinion.
Kari's suggestion for strawberries is always a hit. One of my favorites is to wash and hull fresh, red, ripe strawberries and cut them in half. Mix softened cream cheese with some DaVinci Sugar Free Vanilla syrup to taste. Mix it well and spoon about 1/2 tablespoon into each strawberry half. For a really pretty dessert, pipe the cream cheese into the strawberries with a star tip. They are sooo delicious and very attractive. I've served these many times to low-carb skeptics who loved them. It's my little secret.
I hope you have a great time at the party.