In a mixing bowl, beat butter and 1/4 cup peanut butter at medium
speed of an electric mixer until creamy; gradually add granulated sugar
and brown sugar, beating well. Add
egg and vanilla; beat well. Combine flour, baking soda, and cocoa;
gradually add to butter mixture,
beating well. Set aside.
Combine remaining 3/4 cup peanut butter and confectioners sugar, beating
until blended. With floured
hands, shape mixture into 30 (one inch balls).
Preheat oven to 300 degrees. Shape about 1 tablespoon chocolate
mixture around each peanut butter ball.
Place 2 inches apart on ungreased baking sheets. Dip a flat bottomed
glass into granulated sugar and flatten
each ball into 1 1/2 inch circle.
Bake 10 to 12 minutes (cookies will be soft). Cool slighltly on
baking sheets; transfer to wire racks to cool
completely.
Yield: about 2 1/2 dozen cookies.