Key Lime Pie Cookies - Crystal Sugar

Ingredients

• 2 cups all-purpose flour*
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup (2 sticks) unsalted butter, room temperature
• 3/4 cup Crystal Sugar Extra Fine Granulated Sugar
• 1 large egg
• 2 teaspoons vanilla extract
• 1 teaspoon fresh key lime zest
• 1 cup Crystal Sugar Confectioners Powdered Sugar
• 1 tablespoon fresh key lime juice
• 1/2 teaspoon vanilla extract
• 1 teaspoon milk
• Crushed graham cracker crumbs, optional topping