01 -
Heat your oven to 325°F (163°C) - not 350°F! Give a 10-12 cup Bundt pan a generous coating of butter or nonstick spray.
02 -
Using a mixer with paddle or whisk attachment, beat the butter on high for about 2 minutes until smooth and creamy. Scrape down the bowl with a spatula. Add cream cheese and beat on high for another minute until smooth. Mix in sugar on high for a minute, then blend in sour cream and vanilla until the mixture is creamy and well combined. Give everything a good scrape down again.
03 -
Reduce to low speed and add eggs one at a time, letting each fully incorporate before adding the next. Be careful not to overmix after all eggs are in.
04 -
Once the last egg is mixed in, stop the mixer and add cake flour, baking powder, and salt. Beat on medium speed just until combined - don't overmix! Give the batter a final turn with a spatula or sturdy whisk to catch any lumps at the bottom. The batter should be somewhat thick and very creamy.
05 -
Pour or spoon batter evenly into your prepared pan. Tap the pan on the counter once or twice to release any air bubbles. Bake for 75-95 minutes, loosely covering with foil halfway through to prevent over-browning. The key is slow, low baking. Test with a toothpick - it's done when it comes out completely clean. Don't worry if it takes longer - this is a large, heavy cake!
06 -
Let the cake cool in the pan for 2 hours, then flip onto a wire rack or serving dish to cool completely. Slice and serve with optional whipped cream and fresh berries if desired.