This is a recipe that belonged to my Grandmother.
1/2 C peanut butterThoroughly cream peanut butter & butter. Add sugars gradually and cream until light and fluffy. Beat in egg and vanilla. Sift together flour, slat, and soda. Add slowly to creamed mixture. Form dough into small balls. Place on ungreased cookie sheet. Press down with the tines of a fork.
Bake 8-10 minutes @ 375'F until done and lightly brown.