Preheat oven to 375 degrees.

In small bowl, combine flour, baking soda, and salt.

In separate bowl, cream together butter, peanut butter, sugar, and brown sugar until light and fluffy.

Add egg and vanilla.

Blend in dry ingredients gradually. Mix thoroughly.

Shape dough into balls using a rounded teaspoon for each.

Roll balls in sugar and place on ungreased cookie sheets.

Bake for 8 minutes.

Remove from oven; place a kiss on top of each cookie, pressing firmly so cookie cracks around edge.

Return to oven and bake 2-5 minutes until golden brown.