Chocolate Bread Pudding

Name: Chocolate Bread Pudding
Prep time: 40 min
Cook time: 50 min
Total time: 90 min
Yield: 6 to 8
Ingredients: 4 ounces semi-sweet chocolate; 2 cups whole milk; 1 cup sugar; 2 tablespoons cocoa powder; 3 tablespoons unsalted butter; 2 tablespoons bourbon; ½ teaspoon cinnamon; 4 large eggs; ¼ teaspoon salt; 1 teaspoon vanilla extract; 4 cups (packed) 1-inch challah cubes (about 9 oz), from 1 loaf; Vanilla ice cream, for serving