Add softened butter, egg yolks, vanilla, and enough milk to form a soft but not sticky dough.
Roll out the dough and press it into a greased or parchment-lined 9×13-inch (23×33 cm) baking pan.
Prepare the walnut topping
Beat egg whites until stiff peaks form.
Gently fold in sugar, ground walnuts, and vanilla sugar.
Spread the walnut mixture evenly over the dough base.
Bake
Bake in a preheated oven at 350°F (175°C) for about 25–30 minutes, until the top is lightly golden and set.
Optional glaze
Mix powdered sugar with hot water or lemon juice until smooth and glossy.
Drizzle over the baked bars while still slightly warm.
Cool and cut
Let the bars cool completely before cutting into squares or rectangles.
✨ These bars are crisp on the bottom, chewy on top, and filled with the rich flavor of walnuts — a true Hungarian-style treat!
Would you like me to also share the Hungarian layered version (Diós Kocka with jam and chocolate glaze)? That one is even richer and very popular at Christmas.
