1. Preheat oven to 350 degrees.
2. In large bowl, cream the butter, peanut butter, and sugar together.
3. Beat in the egg and vanilla until fluffy.
4. In separate bowl, combine flour, baking soda, baking powder, and salt. Stir into creamed mix.
5. Roll dough into 1 inch balls and place on lightly greased baking sheet.
6. Indent center of each ball with thumb and fill with a small dollop of jelly.
7. Bake 10 to 12 minutes or until cookies are lightly browned.
