In small bowl blend flour, cocoa and baking soda. Mix until well blended.
In large bowl beat sugars, butter or margarine and the 1/4 cup peanut butter
until light and fluffy. Add vanilla extract and egg; beat. Stir in flour mixture
until blended. Set aside.
Filling: Combine confectioners' sugar and the 3/4 cup peanut butter. Blend
Roll filling into 30 (1-inch) balls. For each cookie, with floured hands, shape
about 1 tablespoon of dough around 1 peanut butter ball, covering completely. Place
2 inches apart on an ungreased cookie sheet. Flatten with glass dipped in sugar.
Bake at 375 degrees F (190 degrees C) for 7 to 9 minutes. When cookies are done,
they should be set and slightly cracked.