Ingredients: 1 cup unsalted butter, softened 1 cup granulated sugar 1 large egg 1 teaspoon vanilla extract 2 1/4 cups all-purpose flour 1/2 teaspoon baking powder 1/4 teaspoon salt 1 cup pistachio nuts, finely chopped Instructions: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper. In a large mixing bowl, beat the butter and sugar together until light and fluffy. Add the egg and vanilla extract, and beat until well combined. In a separate mixing bowl, whisk together the flour, baking powder, and salt. Add the dry ingredients to the wet ingredients, and mix until a soft dough forms. Stir in the chopped pistachios. Drop spoonfuls of the dough onto the prepared baking sheet, leaving about 2 inches of space between each cookie. Bake for 10-12 minutes, or until the edges of the cookies are lightly golden. Remove the cookies from the oven and let them cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely. Enjoy your pistachio cookies!