These almond macaroons are light and airy -- perfect for teatime or dessert.
Preheat oven to 300 degrees. Line a baking sheet with parchment paper, and set aside. Place almond paste, sugar, and salt in the bowl of an electric mixer fitted with the paddle attachment; beat on medium speed until mixture looks crumbly, about 3 minutes. Add egg white and vanilla. Continue beating until mixture is smooth and thick, about 3 minutes more.
Drop 12 even tablespoons of batter about 2 inches apart on lined baking sheet; place 2 almond slices on each mound of dough. Bake cookies, rotating baking sheet halfway through, until golden brown, 20 to 25 minutes. Transfer cookies to a wire rack; let cool completely. Just before serving, lightly dust confectioners' sugar over cookies.
Cookies can be stored in an airtight container at room temperature for up to five days.