Almond Roca Cookie Bars

Bahan-bahan (16 porsi)

• 1 cup butter
• ½ cup granulated sugar
• ½ cup brown sugar
• 1 egg yolk, (beaten)
• 1 teaspoon vanilla
• 2 cups cake flour
• 4 tablespoons cornstarch
• 12 ounces milk chocolate chips
• 1 cup sliced almonds, (coarsely chopped)