Ingredients:

50ml margarine
250g marshmallows
2ml vanilla
1.25 l or 5cups Rice Krispy cereal

Method:

First, in large saucepan over low heat, melt margarine. Add marshmallows; Stir until melted and well blended. Remove from heat.
Second, stir in vanilla. Then, add cereal stirring until thoroughly coated.
Next, using lightly-buttered spatula, press into buttered pan. Finally, cool and cut into squares.