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1. Preheat oven to 350 degrees and line pans with cupcake liners.
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2. In a large bowl, gently combine eggs, egg whites and oil.
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3. Add buttermilk, sour cream and vanilla. Mix.
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4. Add cake mix (for easy mixing, sift in) and stir until combined.
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5. Fill cupcake liners ¾ full and bake for 16-20 minutes or until an inserted knife comes out clean.
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6. Once cupcakes are nearly cool, make ganache.
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7. White Chocolate Ganache: Use a microwave or double boiler to heat white chocolate chips and heavy cream and stir until smooth. Be careful not to burn the white chocolate.
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8. Dip the tops of the cupcake in the ganache.
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9. Buttercream: Beat cream cheese, butter and zest until light and fluffy, it should take about 4 minutes. Slowly add powdered sugar until you reach your desired consistency. If you need to loosen the buttercream, add a tablespoon of orange juice.
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10. Pipe onto cupcakes once the ganache has set and top with sprinkles. I used a 1M tip and used a rosette piping technique.