Melt-In-Your-Mouth Butter Pecan Thumbprint Cookies with White Chocolate Feuilletine

unsalted butter

powdered sugar

vanilla extract

flour

chopped pecans

unsalted butter, melted

white chocolate, melted

heavy cream, heated until hot

Abut ¾ to 1 cup feuilletine or crushed corn flakes or crushed sugar cones or crushed Piroline cookies, the ones without filling, or crushed rice krispies (see note below) *