Tunnel of Fudge Cake

Ingredients

Original recipe (1X) yields 12 servings

• 1 ½ cups milk
• 1 (3.5 ounce) package non-instant chocolate pudding mix
• 1 cup semisweet chocolate chips
• 1 ⅓ cups white sugar
• ¾ cup butter, softened
• ½ cup shortening
• 1 teaspoon vanilla extract
• 4 eggs
• 2 cups all-purpose flour
• 3/4 cup unsweetened cocoa powder, divided
• ½ teaspoon baking powder
• ½ teaspoon salt
• 1 cup milk
• 2 cups chopped walnuts
• ¾ cup confectioners’ sugar
• 6 tablespoons milk, or as needed