Ingredients
- ½ cup (115g) butter, softened
- 1 cup (220g) packed dark brown sugar
- 1 large egg
- 2 tsp. vanilla extract
- ½ cup (105g) mashed potato, cooled
- 2 oz. (56g) unsweetened chocolate, melted
- 1½ cups (210g) all-purpose flour
- ¾ tsp. salt
- ½ tsp. baking soda
- ¾ cup (180ml) buttermilk
- ½ cup (55g) chopped walnuts
- 1 Tbsp. butter, softened
- 1 oz. (28g) unsweetened chocolate
- 1 cup (120g) powdered sugar
- 3 Tbsp. hot water
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