1.Place the raisins and water in a glass measuring cup and microwave for 1 minute. Mix the raisins so that they absorb the water.
2.In a mini chopper, blend raisins until smooth. Pureeing the raisins intensifies their sweetness and gives the bars a lot of moisture. If you don’t want to puree the raisins, that’s Ok; just add them to the batter.
3.Add the raisin puree to the wet ingredients.
4.In a separate bowl, whisk the flours, baking soda and cinnamon.
5.Add the dry mixture to the wet mixture, and add the oats and walnuts. Mix everything together.
6.Spread batter onto a 9 x 13 baking dish that has been sprayed with cooking spray.
7.Preheat oven to 350 degrees. Bake anywhere from 20 to 23 minutes, until light brown. You can test with a toothpick (it will come out clean or with moist to dry crumbs when ready).
8.Before cutting the bars, let them cool. Cut into 24 bars.