Beat in eggs, one at a time, until thoroughly blended.
Add vanilla extract and slowly beat in peanut butter.
Sift flour with baking powder and salt.
Add flour mixture, a little at a time, until well blended.
Line a 9- or 10-inch tube pan on the bottom with wax paper.
Spoon in batter and bake at 350 degrees F for 45 minutes.
Reduce heat to 325 degrees F and bake 15 to 20 minutes longer, until cake tests
done. If desired, toward the end of baking, while cake is still soft, sprinkle
about 1/3 cup finely chopped peanuts onto batter to give it a crunchy
Cool in pan on wire rack for 10 minutes, then remove from pan and cool