The Beer You Should Be Adding To Store-Bought Chocolate Cake Mix - Tasting Table
Briefly

Using stout in chocolate cake mix not only enhances the cake’s chocolate flavors with its unique bitter notes but also improves texture through added moisture and airiness.
Stout beer, especially varieties like milk or oatmeal stout, contributes flavors that complement chocolate, while its carbonation helps achieve a light and fluffy cake crumb.
Read at Tasting Table
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