In a mixing bowl, combine graham cracker crumbs and melted unsalted butter, stirring until well blended. Press this mixture into the bottom of a lined baking dish to form a solid base.

In a blender, combine soaked cashews, powdered sugar, and vanilla extract. Blend until smooth and creamy.

Spread the creamy cashew mixture evenly over the prepared crumb base in the baking dish.

Place the dish in the refrigerator and allow the Silvanas to chill for at least 2 hours.

Slice into squares or rectangles and roll each piece in chopped nuts.

Dust the top with cocoa powder for extra flavor before serving.