In a small food processor, grind the walnuts but leave some chunks for texture.
In a small bowl, mix together the crust ingredients. It will look a bit dry but try to evenly disperse the almond butter.
In a large pan or wok on the stove, add in the berries and maple syrup.
Heat at just over medium until the berries start to bubble a bit. Turn the heat to just below medium.
Use a potato masher to mash the berries and add in the chia seeds. Stir.
Cook a few more minutes until the berries are mashed and turn the heat to low. Cook a couple more minutes stirring frequently. Turn off and remove from heat. Let sit.
You want the berry mixture to be starting to get sticky but no burned, jam-like but a bit runnier.
Preheat the oven to 350 degrees.
Grease an 8x4 dish and portion ¾ of the crust mixture into the bottom. Press down until flat.
Pour the berry mixture over top and smooth it out. Finish it by crumbling the rest of the crust mixture.
Bake for 20 minutes in the oven and then broil for only 60 seconds. Remove from the oven, let cool slightly and enjoy!