sift together flour and cocoa, set aside
beat butter for 30 seconds then add sugar and salt, beat until combined
add egg yolk, milk and vanilla, combine well
beat in flour until just combined
cover dough or wrap in plastic and chill for 1 hour
preheat oven to 350°, line cookie sheet with parchment paper and set aside
shape dough into 1" balls, roll in lightly beaten egg white and then in finely crushed pecans
place 1" apart on cookie sheet, using the handle of a wooden spoon make an indent in the center of each cookie and bake for 8-10 minutes
remove from oven and if needed make the center cavity again and let cool completely
melt caramels and cream on stove until smooth and creamy
spoon about 1 teaspoon of caramel into the center cavity in cookie, let set
melt chocolate wafers according to package directions and drizzle over cookies, let set