Ingredients
Vegetable oil, cooking spray
3/4 cup (1 1/2 sticks) unsalted butter, cut into pieces
6 ounces semisweet chocolate, thinly chopped
3 large eggs
1/2 cup packed light-brown sugar
1 teaspoon pure vanilla extract
1/2 teaspoon coarse salt
3/4 cup all-purpose flour
1/4 cup plus 2 tablespoons dark rum
Coarse sanding sugar, for rolling