| 1 | Cream butter and sugar, add egg yolk and vanilla. |
| 2 | Stir in flour. |
| 3 | Spread mixture thinly on greased cookie sheet. |
| 4 | Bake at 350 °F for 15 to 20 minutes. |
| 5 | Melt chocolate over hot water and spread over warm baked cookies. |
| 6 | Sprinkle on nuts and press them firmly. |
| 7 | Cut in bars while still warm. |
| 8 | Let stand until chocolate is dry. |
