Quick Tunnel of Fudge Cake

Filling:
1 1/2 c milk
1 pkg (3.4 oz) chocolate fudge pudding (not instant)
1 c semisweet choc. chips
1 T butter

Cake:
devils food cake mix
1/2 c veg oil
1/2 c sour cream
1/2 c water
4 large eggs
1 t vanilla

Place milk in medium sauce-pan and whisk in the pudding mix. Cook, stirring over med. heat until the mixture comes to a boil. Remove from heat and add the rest. Stir till smooth.

Preheat oven to 350 degrees. Prepare bundt pan.

Combine ingredients and mix on low 1 min. Scrape sides and mix 2 min. more till smooth. Reserve 2 cups of batter. Pour remaining batter in pan. Spoon pudding mixture in a ring on top of the batter, making sure it doesn't touch the sides of the pan. Spoon reserved batter over filling, smoothing it out with spatula.
Bake until springs back when lightly pressed with finger and is just starting to pull away from the sides of the pan, 45-50 min.
Cool.

Prepare Icing:
Martha's Chocolate Icing
1 cup granulated sugar
5 T butter
1/3 c whole milk
1 c semisweet choc chips

Place sugar, butter and milk in med-heat pan. Stir till comes to a boil, 3-4 min. Still stirring, let mixture boil till sugar dissolves, 1 min. Remove from heat. Stir in chips and stir till smooth. Spread over cooled cake.