Cream together the softened butter and granulated sugar until light and fluffy, about 2-3.

Add in the egg and vanilla extract, mixing until well combined.

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add to the butter mixture and mix until just combined. Fold in the chopped pistachios.

Scoop tablespoon-sized portions of dough, roll into balls, and place on a baking sheet, flattening slightly.

Preheat oven to 350°F and bake cookies for 10-12 until edges are golden and centers are soft.

Let cookies cool on the baking sheet for 5 before transferring to a wire rack.

Beat together cream cheese, powdered sugar, almond extract, and milk until smooth and fluffy.

Spread cream filling on the bottom of one cookie and sandwich with another cookie.