To make the almond frangipane, cream together the almond flour, granulated sugar, and softened butter in a medium bowl until smooth. Add the egg yolk, almond extract, and vanilla extract, and mix until fully combined and creamy. Set aside.
½ cup almond flour, ¼ cup granulated sugar, ¼ teaspoon salt, ¼ cup unsalted butter, 1 egg yolk, 1 teaspoon almond extract, ½ teaspoon vanilla extract