INGREDIENTS
For the cupcakes:
15 tbsp
butter, at room temperature
1 3/4 cups
plus 2 tbsp. dark brown sugar, lightly packed*
1 1/2 tbsp
canola oil
3
large eggs
1 1/2 tbsp
dark rum
2 1/2 tsp
vanilla extract
3 cups
all-purpose flour
3/4 tsp
baking powder
3/4 tsp
baking soda
1 tsp
salt
1 cup
plus 2 tbsp. sour cream
For the frosting:
2 sticks
unsalted butter, at room temperature, divided
1
cup dark brown sugar, lightly packed
1/2
cup heavy cream
1/4 tsp
salt
2 tsp
dark rum
1 cup
confectioners’ sugar, sifted
For the butterscotch sauce:
6 tbsp
dark brown sugar
3 tbsp
butter
1/4 cup
light corn syrup
coarse salt
1/4 cup
heavy cream