The process of making this chocolate Bundt cake is simple but requires attention to detail for the best results. Follow these step-by-step instructions to ensure your cake turns out moist, rich, and full of flavor.
Start by whisking the hot water and unsweetened cocoa powder together in a medium-sized bowl until smooth and well combined. Allow the mixture to cool for about 10 minutes before moving to the next step. This creates a rich chocolate base that will infuse the entire cake with its deep flavor.
In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking soda, and salt. This ensures that the dry ingredients are evenly distributed, which helps the cake rise evenly during baking.
To the cooled cocoa mixture, add the melted unsalted butter, sour cream, vegetable oil, eggs, and vanilla extract. Whisk these ingredients together until well combined. This mixture will create the rich, moist crumb of the cake.
Gradually pour the wet cocoa mixture into the bowl with the dry ingredients. Stir the two together until no streaks of flour remain. Be careful not to overmix, as this can affect the cake's texture. Once fully combined, pour the batter into your prepared Bundt pan.