Preheat the oven to 350℉.

Place chopped dates in a bowl and cover with baking soda and boiling water. Let mixture cool.

Whip softened butter and sugar until well blended, about 45 seconds. Add eggs and mix.

Sift flour, salt, and cocoa powder; measure 2 cups of the mixture.

Add dry ingredients to wet ingredients gradually and stir.

Fold in the cooled date mixture, walnuts, and chocolate chips.

Pour batter into a 9×13-inch pan and spread evenly.

Sprinkle chocolate chips and walnuts on top.

Bake uncovered for 30 minutes.

Cool completely, then cut into squares and dust with powdered sugar.