Using a paring knife, cut the top middle section of your cupcakes and fill each one with chocolate syrup. Cover the holes with the cupcake pieces you cut out.
Step 2
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In a stand mixer, slowly start beating butter, sugar, milk, and vanilla to make your buttercream. Gradually increase the speed to high. The buttercream is ready once it forms stiff peaks.
Step 3
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Using a piping bag, generously frost your cupcakes with the buttercream.