Preheat your oven to 350°F (175°C). Line your 9x9-inch baking pan with parchment paper, allowing some overhang for easy removal later.
In a mixing bowl, combine the sliced almonds, melted butter, and half of the chopped white chocolate (6 ounces). Stir until well combined. Press this mixture firmly into the bottom of the prepared baking pan to create an even layer for your crust.
Place the pan in the preheated oven and bake for 10-12 minutes, or until the crust is lightly golden. Remove from the oven and set aside to cool slightly.
Melt the remaining 6 ounces of white chocolate using a double boiler or microwave. If using a microwave, heat in 30-second intervals, stirring in between until smooth. In a mixing bowl, whisk together the eggs and sugar until well combined, then add the melted white chocolate, flour, salt, and almond extract. Mix until smooth and creamy.
Spread the raspberry jam evenly over the baked crust. Pour the white chocolate filling over the jam layer, spreading evenly to cover the jam completely.
Return the pan to the oven and bake for an additional 20-25 minutes, or until the filling is set and lightly golden on top.
Once baked, remove the pan from the oven and allow it to cool completely in the pan. Once cooled, use the parchment paper to lift the bars out of the pan. Cut into squares and enjoy your delicious Raspberry Filled White Chocolate Bars!