In a sauce pan, melt the butter and the marshmallows, stirring constantly.
In a large bowl, mix together the cereal and the dried berries.
Add the melted mixture to the berry mixture; stir well to combine.
Spread the mixture onto a sheet pan covered with parchment paper. It should be about 1-inch thick. Let cool.
Once cool, using a 2 1/2 or 3-inch ring cutter, cut out the cookies. Make sure to cut the cookies as close as possible to minimize waste. Save the cookie scraps as snacks.