
This is the kind of celebration cake that makes people ask for the recipe before they've even finished their slice. The crumb is tender and lightly golden, built on a clever combination of whole milk, sour cream, neutral oil, and a splash of white vinegar that does all the heavy lifting eggs usually handle. That vinegar reacts with the baking soda to give the layers a beautiful rise, so you genuinely don't miss a thing. The frosting is a classic whipped butter and powdered sugar situation, spiked with vanilla and just enough heavy cream to make it cloud-like and perfectly spreadable. It comes together in two 9-inch layers with a generous filling of frosting in the middle, making every slice a proper celebration. Rainbow sprinkles on top are optional, but honestly, why wouldn't you? This recipe makes 12 servings, so it's built for a crowd and ready to be the centerpiece of any birthday table.
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Preheat the oven to 350°F (175°C). Grease two 9-inch round cake pans with butter or cooking spray, line the bottoms with parchment paper, and grease the parchment.
In a large bowl, whisk together the flour, granulated sugar, baking powder, baking soda, and salt until evenly combined.
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