Preheat your oven to 350°F (180°C).

In a large mixing bowl, cream together the softened butter and powdered sugar until light and fluffy.

Gradually add the all-purpose flour, cornstarch, and salt to the butter mixture, stirring until just combined.

Fold in the chopped cranberries, pistachios, and white chocolate chips until evenly distributed.

Scoop out tablespoons of the dough, roll them into balls, and place them on a baking sheet lined with parchment paper. Flatten them slightly.

Bake for about 12-15 minutes or until the edges are lightly golden.

Let them cool on the baking sheet for a few minutes, then transfer to a wire rack to cool completely.