INGREDIENTS
4 tbsp
unsalted butter, softened
1/4 cup
+ 2 tablespoons sugar
1
egg yolk
1/2 tsp
vanilla
1/2 cup
flour
1 tbsp
+ 1 teaspoon unsweetened cocoa powder
1/4 tsp
baking soda
1/8 tsp
salt
2 tbsp
buttermilk
1/4 cup
Dr. Pepper (don't use diet)
1 tbsp
butter
2 tsp
cocoa powder
2 tbsp
Dr. Pepper
1 cup
powdered sugar
1/4 tsp
vanilla