Step 1

In small saucepan, whisk together flour, sugar and salt to ensure there are no clumps. Stir in milk and heat over medium low heat until thickened. It will go really slow at first, but once it starts to thicken in will go quickly. Set aside and let cool to room temperature or cover and chill in the refrigerator to speed up the process.

Step 2

Beat the butter until smooth and creamy. Add the cream cheese, beating until smooth. Scoop in thickened milk mixture and add the vanilla, then turn mixer to high and let whip for at least 5 minutes.

Step 3

Frost your cake and store in the refrigerator.