Combine 2 oz all purpose flour, 8 oz granulated sugar and ½ teaspoon salt in a saucepan, whisk to combine. Slowly whisk in 8 oz whole milk until smooth. Heat the mixture over medium low, whisking constantly, until it begins to boil.
Continue to cook and stir for 2-3 minutes until it thickens to a pudding-like texture. Immediately remove from the heat. Sift 1 ½ oz malted milk powder and 1 oz cocoa powder over the pudding and whisk until smooth. Transfer to a bowl. Add 2 teaspoons vanilla extract and cool to room temperature.
Cream 8 oz unsalted butter until light and fluffy. Add the pudding, a little at a time, until completely incorporated. Switch to the whisk attachment and whip the buttercream until it’s light and fluffy.
Use immediately to fill and frost your favorite cake.
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