Lemon Almond Cookie Brittle

Bahan-bahan (24 porsi)

• 3/4 cup (1½ sticks) butter, (at room temperature)
• 3/4 cup granulated white sugar
• 1½ teaspoons finely grated lemon zest
• 1 teaspoon vanilla extract
• 1/8 teaspoon salt
• 1½ cups all purpose flour
• 1 cup coarsely chopped toasted sliced almonds
• sifted powdered sugar, (for dusting the top)