- Preheat oven 180°C/350°F. Melt the butter and Guinness in a saucepan over low heat.Whisk in the cocoa powder and sugar granulated sugar. Remove from the heat. Whisk the sour cream with the eggs and vanilla in a separate bowl until combined, then add to the Guinness mixture. Whisk in the flour and baking soda until combined.
- Pour the cake batter onto a parchment paper lined half-sheet pan and bake for 20-25 minutes or until the cake is set to the touch.
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