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.
1/2 cup almond flour, 1/4 cup granulated sugar, 1/4 teaspoon salt, 1/4 cup unsalted butter, 1 egg yolk, 1 teaspoon almond extract, 1/2 teaspoon vanilla extract