Any recipe that includes butter, brown sugar and rum is bound to be a winner ....
2 sticks butter, melted
2 cups brown sugar
2 teaspoon vanilla
2 tablespoons dark rum
2 cup flour
2 cup walnuts, coarsely chopped
Butter a 13 x 9 pan.
Pour melted butter into mixer, and add brown sugar. Cream until well mixed. Mix in eggs, vanilla, salt and rum. Add flour and beat until just combined. Add walnuts and mix until stirred in.
Scrape batter into pan and spread with spatula until about evenly covering pan. Bake 25-30 minutes, or until done (like brownies be careful not to overbake - they'll set up a bit more as they cool). Cool completely before cutting, if you can wait.