Chocolate Sundae Sauce - cooking recipe

Ingredients

1 c. butter
4 sq. unsweetened baking chocolate
4 c. powdered sugar
13 oz. evaporated milk
2 tsp. vanilla

Preparation

In double boiler, melt chocolate in butter.
Add sugar and milk; cook over low heat for 10 minutes.
Add vanilla.
Sauce thickens as it cools.
Make the day being used.