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Preheat oven to 350 degrees. Make sure all your ingredients are room temperature.
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Spray three 9 inch cake pans with nonstick cooking spray or line 3 muffin tins with cupcake liners.
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In a separate bowl, combine cake flour, salt, baking powder and soda and mix.
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In your mixer fitted with the paddle attachment, blend butter, sugars and vanilla at medium speed until pale and fluffy.
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Add eggs and yolks, one at a time, scraping the bowl after each addition.
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Reduce speed to low and add a cup of the flour mixture followed by ⅓ of the buttermilk.
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Repeat this 3 times, until you have incorporated all the flour and buttermilk.
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Stir in confetti sprinkles.
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Divide the batter among 3 cake pans or fill cups with cupcake batter ⅔ full and gently tap on counter to remove air bubbles.
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Bake cakes for 35 minutes or cupcakes for 15-17 minutes or until toothpick is inserted and comes out clean.
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Allow to cool completely before frosting.
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Milk Soak-
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When cakes are cooled, lightly brush with milk/vanilla soak.
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Vanilla Bean Frosting
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Beat butter and extract for 2 minutes.
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Add powdered sugar and milk or cream.
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Beat with whisk attachment for 3 minutes on high.
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If the frosting still looks to wet, add more powdered sugar in ½ cup increments.
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Add desired coloring to frosting.
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Frost Cake or pipe frosting onto cupcakes and top with sprinkles.
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If you would like to add the white chocolate ganache, refrigerate frosted cake until cold and set (at least an hour).
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Combine white chocolate and cream in a microwave safe bowl. Microwave on high for 1 minute.
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Remove from microwave and stir until smooth. If it is still chunky, microwave for additional 10 second increments until smooth.
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Stir in 1-2 drops of food coloring.
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Allow to cool for 3-5 minutes then pour over cake. Return cake to fridge until ganache has set.
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When ready, slice and serve!