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Next, introduce key moistening elements like sour cream, oil, and vanilla extract. Whisk these until smooth, adding in three whole eggs for richness. A rubber spatula is essential here to scrape down the bowl and ensure every ingredient is thoroughly mixed—there’s nothing worse than clumpy batter!
In a separate bowl, combine your dry ingredients: cake flour, brown sugar, white sugar, baking powder, baking soda, and a pinch of salt. A brief whisk integrates these ingredients before pouring in the wet mixture. Mixing on low speed with a paddle attachment allows for a smooth blend, and remember to scrape down the sides of the bowl to prevent any residual dry ingredients from hiding at the bottom.