Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper and set aside.
In a food processor, add walnuts, ground cinnamon, cardamom, and salt. Blend until walnuts are well chopped.
Place 5 layers of phyllo dough on the baking sheet, brushing each layer with melted butter.
Spread 2/3 cup of the walnut mixture on top of the dough evenly.
Add another 5 layers of the phyllo dough and brush each layer with butter. Then add another 2/3 cup of the walnuts. Repeat until you use up all the dough and walnut mixture.
Cut the assembled baklava into squares with your desired sizes.
Bake for 45-50 minutes or until the edges are golden brown. Let it cool for 15-20 minutes.
Drizzle with melted chocolate or your favorite syrup. Serve and enjoy!