01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper, allowing excess on two sides for easy removal.
02 - In a large mixing bowl, beat the butter and sugar together until pale and fluffy. Mix in salt, vanilla extract, and almond extract until fully incorporated.
03 - Gradually add the flour to the mixture and blend on low speed until the mixture forms coarse crumbs.
04 - Press two-thirds of the dough evenly into the base of the prepared pan to form a firm, uniform layer.
05 - Evenly spread the raspberry jam over the dough layer, leaving a narrow border around the edges.
06 - Scatter the remaining dough in clumps over the jam. Sprinkle sliced almonds evenly over the top.
07 - Bake for 28 to 32 minutes or until the crumble topping is golden and almonds are just toasted.
08 - Let cool completely in the pan. Use the parchment overhang to lift out and slice into bars.