Squares chocolate and pistachios

ingredients:
- 250 g of softened butter 
- 100g icing sugar
- 1 egg
- 1 teaspoon baking powder
- 1 teaspoon vanilla
- 2 tablespoons cocoa
- flour
For the decoration:
- Melted chocolate
- Molds pistachios
method:

* In a bowl, mix the butter , sugar, egg, baking powder and vanilla, divide the mixture into two parts, one to add the cocoa. 
* Collect 2 parts  (brown and white) each to share with flour.
* Roll the dough 2 to share in each rectangle, place a white rectangle, brown above and then finally a white rectangle.
* Lower all, then cut out squares with a knife.
* Bake at 160 ° for 20 minutes
* After cooking decorate with melted chocolate and features with ground pistachios.
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