01 - Line an 8x8-inch square baking pan with parchment paper, leaving enough overhang on the sides to lift the bars out easily after setting.
02 - Pulse raw almonds in a food processor until finely ground. Add pitted Medjool dates, sea salt, and melted coconut oil; process until the mixture clumps together when pinched. Transfer to the prepared pan and press firmly into an even, compact layer. Place the pan in the freezer to firm up while preparing the filling.
03 - Combine blueberries, maple syrup, and lemon juice in a small saucepan over medium heat. Stir frequently until the berries burst and the mixture reduces to a thick, jammy consistency, about 5 to 7 minutes. Remove from heat, let cool slightly, then mash or blend into a smooth sauce.
04 - Add the soaked and drained cashews, coconut cream, fresh lemon juice, lemon zest, maple syrup, vanilla extract, melted coconut oil, and a pinch of sea salt to a high-speed blender. Blend on high until completely silky and lump-free, scraping down the sides as needed.
05 - Pour the cashew lemon cream over the chilled crust and use a spatula to spread it into an even layer.
06 - Drop spoonfuls of the blueberry sauce across the surface of the cashew layer. Drag a toothpick or thin knife through the dollops in sweeping motions to create a marbled pattern.
07 - Place the pan in the freezer for at least 4 hours, or until the filling is completely firm to the touch.
08 - Lift the slab from the pan using the parchment overhang. Let it rest at room temperature for about 10 minutes for cleaner slicing, then cut into 12 bars. Serve chilled and store any leftovers in the freezer for up to 2 weeks.