Combine butter and chocolate in a heavy saucepan; cook over low heat until chocolate melts. Add milk, sugar, and syrup; bring mixture to a boil, and cook 2 1/2 minutes.
Remove from heat, and cool 5 minutes. Add vanilla; stir well. Beat on high speed of electric mixer for 10 minutes or until mixture reaches spreading consistency.
Oxmoor House Homestyle Recipes
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