1 1/2 sticks unsalted butter, softened
2 cups firmly packed dark brown sugar
3/4 cup sugar
4 large eggs
1 large egg yolk
3/4 cup milk
2 tablespoons dark rum
1 teaspoon vanilla extract
3 cups all-purpose flour
1/4 teaspoon salt
1 tablespoon baking powder
1/2 cup toasted pecans, chopped