1/4 c. butter
1 (6 oz.) pkg. semi-sweet chocolate (1 c.)
1/4 c. corn syrup
1 tsp. vanilla flavoring
1 1/2 c. confectioners sugar
2 c. Rice Krispies

Combine first 4 ingredients in saucepan. Cook over low heat until smooth. Mix in sugar and add Rice Krispies. Press evenly in 8x8x2 inch pan. Refrigerate until firm. Cut into squares.