The Extra Ingredient That Makes These Linzers Super Special

Add 2/3 cup granulated sugar and mix with a wooden spoon until combined and creamy. Add 1 large egg, 1 large egg yolk, 1 teaspoon almond extract, 1 teaspoon vanilla extract, and 1/2 teaspoon kosher salt. Stir until combined. Add 2 1/4 cups all-purpose flour and 1 cup almond flour and stir until well combined and no streaks of flour remain.