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| 6 tbsp all-purpose flour | 2 cups sugar | |
| 2 cups milk | 2 tsp vanilla extract | |
| 2 cups unsalted butter, softened |
In a medium-size saucepan, whisk the flour into the milk until smooth. Place over medium heat and, stirring constantly, cook until the mixture becomes very thick and begins to bubble, 10-15 mins. Cover with waxed paper placed directly on the surface and cool to room temperature, about 30 mins.
In a large bowl, on the medium high speed of an electric mixer, beat the butter for 3 mins, until smooth and creamy. Gradually add the sugar, beating continuously for 3 mins until fluffy. Add the vanilla and beat well.
Add the cooled milk mixture, and continue to beat on the medium high speed for 5 minutes, until very smooth and noticeably whiter in color. Cover and refrigerate for 15 mins (no less and no longer—set a timer!). Use immediately.