Thoroughly cream butter, peanut butter, sugars egg, and vanilla. Sift together dry ingredients; blend into creamed mixture. Shape in 1-inch balls; roll in granulated sugar. Place 2 inches apart on ungreased cookie sheet. Press 5 peanut halves atop each or crisscross with fork tines. Bake at 375°F. for 10 to 12 minutes. Cool slightly; remove from pan.

Makes 4 dozen