Add raw cashews to a mixing bowl and cover with boiling hot water. Let rest for 1 hour (uncovered). Then drain thoroughly.
In the meantime, preheat oven to 350 degrees F (176 C) and line an 8x8 inch baking dish with parchment paper.
Add oats, almonds, sea salt, and coconut sugar to a high speed blender and mix on high until a fine meal is achieved.
Transfer to a medium mixing bowl and add maple syrup and melted coconut oil, starting with lesser end of range (4 Tbsp or 60 g as original recipe is written // adjust if altering batch size) and adding more if it's too dry. Stir with a spoon to combine until a loose dough is formed. You should be able to squeeze the mixture between two fingers and form a dough instead of it crumbling. If too dry, add a bit more melted coconut oil.
Transfer mixture to parchment-lined baking pan and spread evenly. Then place parchment paper on top and use a flat-bottomed object, such as a drinking glass, to press down firmly until it’s evenly distributed and well packed.
Bake for 15 minutes, then increase heat to 375 F (190 C) and bake for 5-8 minutes more, or until the edges are golden brown and there is some browning on the surface. Remove from oven to cool slightly, then reduce oven heat to 350 degrees F (176 C).
Once cashews are soaked and drained, add to a high speed blender with coconut cream, arrowroot starch, lemon juice, lemon zest, sea salt, and maple syrup. Mix on high until very creamy and smooth.
Taste and adjust flavor as needed. I added a bit more lemon zest and maple syrup. It should be very lemony, and not overly sweet.
Pour filling over the pre-baked crust and spread into an even layer. Tap on counter to remove any air bubbles.
Bake for 20-23 minutes or until the edges look very slightly dry and the center appears “jiggly” but not liquidy.
Let rest for 10 minutes, then transfer to refrigerator to let cool completely (uncovered) - at least 4 hours, preferably overnight.
To serve, slice and sift with powdered sugar (optional). Store leftovers in the refrigerator, covered, up to 4 days, though best within the first 2 days.
*If you open your can of coconut milk or cream and the cream is not separated from the liquid, that’s ok! Just try and tip out as much of the rich, firm white part and leave the liquid behind. It’s not crucial that it’s entirely cream. But the more cream, the richer the bars will be! *Nutrition information is a rough estimate calculated without organic powdered sugar. *Crust adapted from my Peanut Butter and Jelly Snack Bars.