I often make a double batch of these using a 9X13-inch pan. I cut the bars and wrap at least half the batch in parchment paper and then store them in a resealable bag in the freezer. You can vary the recipe by using unsweetened shredded coconut in place of the flax meal or experimenting with different types of dried fruit. Any type of nut, seed, or soy nut butter will work in place of peanut butter.
Organic brown rice syrup is available in organic markets, specialty markets, and the "health food" section of many supermarkets. Honey works as a substitute, but makes for a slightly more crumbly bar.