In a large bowl, cream butter and confectioners' sugar until light and fluffy. Combine vanilla and espresso powder until dissolved. Add to creamed mixture. Combine flour and salt; gradually add to creamed mixture and mix well.
Shape a heaping teaspoon of dough around each hazelnut, forming a ball. Place 2 in. apart on ungreased baking sheets. Bake at 350° for 8-10 minutes or until bottoms are browned. Remove to wire racks to cool.
For espresso glaze, place confectioners' sugar in a small bowl. Combine the espresso powder and vanilla until dissolved; add to bowl. Stir in enough cream to achieve a dipping consistency; set aside. For chocolate glaze, combine the confectioners' sugar, chocolate and cream.
Dip half of the cookies in espresso glaze. Dip remaining cookies in chocolate glaze; allow excess to drip off. Place on waxed paper and sprinkle with jimmies. Let stand until set.