1 1/2 c. brown sugar, firmly packed
1 1/2 c. granulated sugar
1 1/2 c. milk
2 tbsp. butter

Combine sugars and milk; bring to boil, stirring constantly. Then boil without stirring until soft ball forms when dropped in cold water. Add butter and remove from heat. Cool to lukewarm, beat until thick and creamy and right consistency to spread. Place bowl in hot water to keep soft while spreading.