01 - Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang on the sides for easy removal.
02 - In a large bowl, whisk together the rolled oats, all-purpose flour, light brown sugar, baking powder, and fine sea salt. Pour in the melted coconut oil and vanilla extract, stirring until the mixture becomes crumbly and evenly moistened.
03 - Press approximately two-thirds of the crumble mixture firmly into the bottom of the prepared pan, creating a compact and even base layer.
04 - Bake the base for 12 minutes, or until lightly golden around the edges. Remove from the oven and set aside to cool slightly.
05 - In a high-speed blender, combine the soaked and drained cashews, coconut cream, maple syrup, lemon juice, vanilla extract, and a pinch of salt. Blend on high until completely smooth and silky, scraping down the sides as needed.
06 - Pour the vanilla cashew cream over the partially baked base and spread it into an even layer using a spatula.
07 - In a small bowl, gently mash the raspberries with a fork, then fold in the raspberry jam until combined. Spoon the mixture over the cashew cream layer and spread gently to cover evenly.
08 - Sprinkle the remaining crumble mixture evenly over the raspberry layer, allowing some of the filling to peek through for a rustic appearance.
09 - Bake for 22 to 25 minutes, or until the top crumble is golden brown and the filling is bubbling gently at the edges.
10 - Allow the pan to cool completely at room temperature, then refrigerate for at least 2 hours. Use the parchment overhang to lift the slab out of the pan and slice into 16 even squares.