brown sugar, packed
margarine or butter, softened
finely chopped pecans
Heat oven to 350.
Mix brown sugar, margarine, shortening, egg yolk and vanilla. Stir in flour and salt.
Shape dough into 1-inch balls.
Beat egg white slightly. Dip balls into egg white and roll in nuts.
Place about 1 inch apart on un-greased cookie sheet; press thumb deeply into the center of each cookie.
Bake until light brown, about 10 minutes. Immediately remove from cookie sheet. Allow to cool and fill thumbprints with jelly.
Find it online: https://livelaughrowe.com/thumbprint-cookies/