Tunnel of Fudge Cake

1 . Stage

Make the filling: In a medium pan, combine 1 1/2 cups milk and pudding mix. Cook as directed on the package. Add chocolate chips and stir until melted. Set aside.

2 . Stage

Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 10-inch Bundt or tube pan.

3 . Stage

Make the cake batter: In a large bowl, combine white sugar, butter, and shortening. Beat until light and fluffy. Add vanilla and eggs. Mix well.

4 . Stage

Add flour, 1/2 cup cocoa, baking powder, salt, and 1 cup milk to a bowl. Beat on low speed until moistened. Beat on medium speed for 3 minutes, then stir in walnuts.

5 . Stage

Reserve 2 cups of the batter. Pour remaining batter into the prepared pan. Spoon the filling in a ring on top of the batter, making sure it does not touch the sides of the pan. Spoon reserved batter over the filling.

6 . Stage

Bake in the preheated oven until the cake springs back when touched lightly in the center, 50 to 60 minutes. Cool for 1 hour in the pan, then turn out onto a wire rack and cool completely.

7 . Stage

Make the glaze: In a small bowl, combine confectioners' sugar and remaining 1/4 cup cocoa. Stir in enough milk to reach desired drizzling consistency. Spoon glaze over the cooled cake, allowing some to run down the sides.