In a bowl whisk together flour, salt and cocoa powder

In a large bowl beat butter, sugar and vanilla until light and fluffy

Beat in flour mixture until a dough forms. Chill dough if it's to sticky to work with

Roll into 1 1/2 inch balls

Roll each ball in granulated sugar

Place on prepared pans and press a center indentation with ypur thumb. Bake for about 15 to 18 minutes until the top of the cookie appears dry. Gently press the end of a wooden spoon into each indentation to enlarge it if needed. Cool om wire racks

Fill each cookie center with the caramel buttercream

Top each cookie with gratesd milk chocolate and a few flakes of salt