Preheat the oven to 375 degrees.
In a mixer or food processor, cream together the butter and sugars, just until no streaks of butter remain. Add the peanut butter, and process until combined.
Next, add in the egg and vanilla and mix until combined.
Sift together the flour, baking soda, and salt, and then add them to the rest of the mixture. Blend until just combined.
Roll the dough into one inch balls (25 grams each) and roll each one into the chopped nuts, covering the cookies in nuts.
Place each dough ball on a parchment lined baking sheet, placed two inches apart. You'll need at least three sheets.
Bake one sheet at a time for 10 minutes each, until the cookies are golden.
As soon as the cookies come out of the oven, place a chocolate kiss in the center of each cookie. Let the cookies cool on the sheet for two minutes, and then move them to a wire rack to finish cooling.