Beat butter, sugar and vanilla at medium speed until light and fluffy. Add flour and nuts on low speed until well-blended. Chill dough 2 hours. For each cookie, use about 1 T of dough to encase one candy piece completely. Place on ungreased cookie sheet. Bake at 350 degrees until set but not brown, about 8- 10 minutes. Remove and roll
in powdered sugar.