Homemade Chocolate Frosting

Yummy recipe I've had for years. Origin??? 

 8 tbsp butter, softened 

3 tbsp unsweetened cocoa powder 

1 tsp vanilla 

1/4 tsp salt 

2 cups powdered sugar 

1/4 cup milk

Put softened butter into a mixing bowl and add the cocoa powder. Stir the mixture until it is well combined. Add the vanilla and salt and mix in well. Stir in the powdered sugar alternately with the milk. Stir until the frosting is of a creamy consistency. To thin icing add more milk, a drop at a time. To make a thicker icing add another 1 to 2 tablespoons of powdered sugar.

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