Combine morsels, margarine and
corn syrup in medium size saucepan
with a nonstick surface.
Stir over low heat until melted and smooth.
Remove from heat.
Stir in vanilla extract and sugar.
Add rice krispies and stir lightly
until well coated. Spread evenly into
a buttered 9 x 13" pan.
Chill until firm.
Store in the refrigerator.