Add 1 can milk. Add stick of soft-butter. Mix until well blended. The butter will melt when heat is added.
Put on stove and bring to a boil. Reduce heat to medium and stir constantly until candy reaches soft boil stage. Remove from heat add vanilla. Put kettle into about 3 inches of cold water and continue to stir until candy becomes glossy and you can feel it getting thick. Pour into an 8x8 buttered dish. Let stand until cold. Cut and serve!