Ingredients:

• 1 cup sugar
• 1 tbsp flour
• 1 tsp vanilla
• ½ stick butter (softened)
• ½ cup shortening
• ½ cup milk

Beat everything together at medium speed (high will probably send icing all over the kitchen). Eventually, it should go through a state change and look like a single fluffy substance instead of a mixture; it's ready at this point.