01 -
Set oven temperature to 375°F (190°C) to preheat thoroughly.
02 -
In a large mixing bowl, cream together the softened unsalted butter, eggs, and pistachio instant pudding mix until the mixture is smooth and creamy.
03 -
Gradually incorporate the sugar cookie mix into the wet mixture, stirring until a sticky dough forms.
04 -
Lightly grease a 10 x 15-inch baking sheet. Evenly press the dough into the pan, spreading it all the way to the edges for uniform thickness.
05 -
Place the baking sheet in the preheated oven and bake for 18–22 minutes, or until the edges of the dough turn a light golden color.
06 -
Allow the pan to cool completely. Once cooled, slice the baked cookie base into square bars and serve.