1. Heat oven to 350°F. Beat shortening and peanut butter with mixer in large bowl until well mixed. Add 1/3 cup granulated sugar and brown sugar; beat well. Add egg, milk and vanilla; beat until fluffy.
2. Stir together flour, baking soda and salt; gradually add to peanut butter mixture, beating until blended. Shape 1/2 measuring teaspoons of dough into 1/2-inch balls. Roll in granulated sugar; place on ungreased cookie sheet.
3. Bake 5 to 6 minutes or until set. Immediately press one chocolate into center of each cookie. Remove from cookie sheet to wire rack. Cool completely. Makes about 14 dozen cookies.