Combine the raspberries, blueberries, chia seeds, 1 tablespoon water and the honey in a medium bowl. Smash the mixture with a potato masher or fork until the berries are the consistency of a chunky jam. Cover and refrigerate until the chia seeds soften and the jam thickens slightly, about 30 minutes (the raspberry seeds will give the jam a crunchy texture).
Spread 1 rice cake with 1 tablespoon of peanut butter and top with 1/4 of the chia jam and a slice of pear. Sandwich with another rice cake. Repeat to make 3 more sandwiches
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