Katie Brown | Pistachio Icebox Cookies

Ingredients

• 1 cup unsalted butter, room temperature
• 1 cup light brown sugar
• 1 egg
• 1 teaspoon vanilla extract
• 2 cups all purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1 1/4 cups shelled and chopped coarsely pistachios