Preheat oven to 180C (350F). Line an 8u201d (20 cm) square pan with parchment paper, or spray with nonstick spray.
In a medium bowl, whisk together the coconut sugar, stevia, flax, soymilk, oil, vanilla and almond butter until the sugar is dissolved. Alternatively, powdr the coconut sugar so it will dissolve quickly.)
Cut the bananas into chunks and add to the bowl. Using a potato masher or large fork, mash the bananas into the mixture, leaving a few little chunks (about the size of peas) here and there. Stir in the raisins, if using. Set aside.
In a large bowl, combine the oats, shredded coconut, flour, baking powder and salt. Pour the wet mixture over the dry and stir well to combine. It may seem too wet for a bar dough; this is as it should be.
Scrape the mixture into the pan and smooth the top. Bake for 40-45 minutes, rotating pan about halfway through, until the top is dry and a tester inserted in the centre comes out clean. Cool completely before cutting into 12 or 16 bars. May be frozen.