1
Begin by allowing the unsalted butter to sit at room temperature until it becomes soft.
2
In a large mixing bowl, cream the softened butter and granulated sugar together using an electric mixer on medium speed until the mixture is light and fluffy.
3
Add the full-fat sour cream and pure vanilla extract to the butter-sugar mixture, mixing until thoroughly combined.
4
Gradually add the eggs, one at a time, mixing well after each addition. Then, slowly incorporate the sifted cake flour, alternating with additional mixing until the batter is smooth and well combined.
5
Grease a Bundt pan generously to prevent sticking. Pour the batter into the prepared pan, smoothing the top with a spatula.
6
Place the Bundt pan into a cold oven and set the temperature to 260°F (127°C). Bake for 2 hours, or until a toothpick inserted into the center comes out clean.
7
Once baked, allow the cake to cool in the pan for about 30 minutes before inverting it onto a cooling rack. Let it cool completely before serving for the best texture and flavor.