Blend cashew mixture: Drain soaked cashews and blend with lemon juice, melted coconut oil, milk, maple syrup, and vanilla bean paste until smooth.
Prepare pan: Line an 8x8 pan with parchment paper.
First layer: Place 9 graham cracker squares on the bottom of the pan. Pour half of the cashew mixture over them and smooth it out. Sprinkle half of the raspberries on top.
Second layer: Add another layer of 9 graham cracker squares. Pour the rest of the cashew mixture over this layer, then top with remaining raspberries and mini white chocolate chips.
Freeze: Freeze the pan flat for at least 8 hours.
Serve: Slice into 18 bars. Store in an airtight container in the freezer. Let bars sit at room temperature for 5 minutes before eating for best texture.
Notes
If you don't have vanilla bean paste, you can use vanilla extract.