Chocolate Marshmallow Sauce

1 6-oz pkg chocolate chips
1/2 c evaporated milk
10 large marshmallows
1/4 c butter
1/2 c sugar
1/2 tsp vanilla

Combine chocolate chips, butter, sugar, evaporated milk, vanilla and marshmallows in top of double boiler. Stir until well blended. Cook for 5 minutes, stirring occasionally. Serve warm over cake, ice cream, etc.