No-Bake Potato Chocolate Rum Bars

Name: No-Bake Potato Chocolate Rum Bars
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: European
Ingredients: 1 potato (medium size (ca. 10oz)); 4 oz. chocolate bar, broken in pieces (we like Ghirardelli ); 1 stick butter (at room temperature); 1 box (14.4) oz graham cracker crumbs; 2 cups powdered sugar; 1 tablespoon cocoa powder; A pinch of salt; 1 teaspoon vanilla extract; 5 tablespoons spiced dark rum (we like Captain Morgan); 1 tablespoon vegetable or coconut oil; 3 tablespoons butter or margarine; 4 oz. chocolate bar (broken in pieces)