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Overhead view of Tunnel of Fudge Cake on a white ripple edge plate

Tunnel of Fudge Cake {Tunnel of Doom Cake}

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This Tunnel of Fudge Cake or Tunnel of Doom Cake is a moist vanilla Bundt cake with a generous, rich ribbon of chocolate running through each slice.

Make it a Halloween dessert recipe by transforming it to a Tunnel of Doom Cake, topped with a few seasonal sprinkles. 

Tunnel of Fudge Cake on a white serving plate

Tunnel of Fudge Cake

Any time I heard about a Tunnel of Fudge Cake recipe, I’d make a mad dash to check it out. Most included a boatload of chopped nuts, something my family would not eat. One of my foodie friends shared this recipe. which is sans nut and topped with a glossy chocolate glaze.

I knew I’d found a winner. The first time I made this cake, it was also October. I renamed it Tunnel of Doom cake for Halloween. Who wouldn’t want to have a slice of this decadent cake for some much-needed sustenance after an exhausting night of Trick-or-Treating?

Overhead view of Tunnel of Fudge Cake on a white ripple edge plate

Origin of Tunnel of Fudge Cake

The original tunnel of fudge cake recipe was the Pillsbury bake-off winner in 1966. Created with a package of Double Dutch Frosting Mix, the recipe soon became obsolete when the mix was discontinued. A blogger friend shared her tunnel of fudge cake recipe with me (her blog no longer exists), but I think there are many recreations.

Most recipes I encountered include a couple of cups of chopped walnuts, but my family prefers nut-free desserts. This version was perfect although I tweaked and added extra butter for a pound cake consistency.

Bill went crazy for this tunnel of fudge cake, as did my girlfriends who joined me for coffee, knitting and lots of chit chat. With a dense, buttery crumb and a scrumptious fudgy surprise in every slice, I have a feeling you’ll love this one, too.

Sprinkle your tunnel of fudge cake with some Chocolate Jimmies, White Sugar Pearls and Sparkling Sugar to jazz up the glaze or Halloween Sprinkles if you’re making a “Tunnel of Doom” version for the holiday. If you need a Bundt Pan, the link will direct you to a versatile, non-stick pan with a 10-15 cup capacity.

Once you own a Bundt Pan, check back and try my recipes for White Chocolate Bundt Cake, Kahlua Bundt Cake, Raspberry Amaretto Bundt Cake, Greek Lemon Bundt Cake, and Pumpkin Spice Bundt Cake.

Slice of Tunnel of Fudge Cake on a square white plate with a red handled fork


Like This Tunnel of Fudge Cake? Here are More Fudgy Recipes You’ll Love:

Tunnel of Fudge Cake | A rich butter cake with a fudgy ribbon in each slice. Make for Hallloween as a Tunnel of Doom Cake!

Tunnel of Fudge Cake {Tunnel of Doom Cake}

A vanilla cake with a "tunnel" of fudge. A perfect cake for any occasion!

Prep Time 30 minutes
Cook Time 1 hour
Total Time 1 hour 30 minutes
Yield 12



  • 3 cups flour
  • 2 1/2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1 teaspoon salt
  • 10 ounces semi-sweet chocolate chopped, divided (6 ounces for cake, 4 ounces for glaze)
  • 1 1/2 cups (3 sticks) butter, at room temperature
  • 1 2/3 cups Imperial sugar
  • 1 teaspoon vanilla
  • 3 eggs, at room temperature
  • 1 cup milk
  • 1/2 cup sour cream


  • 2 tablespoons light corn syrup
  • 1/2 cup heavy cream
  • Reserved chocolate


  • Butter and flour, or spray with a flour and oil baking spray, a 12 cup capacity Bundt pan. Set aside. Preheat oven to 350º.
  • Combine the flour, baking powder, baking soda and salt in a bowl and whisk to combine. Set aside.
  • Melt 6 ounces of the chocolate in the microwave (stop and stir every 30 seconds till melted and smooth). Set aside.
  • In a large bowl, beat the butter, sugar and vanilla till fluffy, then add the eggs, one at a time, till incorporated.
  • In another bowl (I used a Pyrex 2-Cup Glass Measuring Cup), whisk together the milk and sour cream. With the mixer on low, alternately add the flour and the milk mixture into the batter, mixing till smooth.
  • Stir 1 cup of this batter into melted chocolate and set aside (chocolate should be warm not hot before adding batter). Set aside.
  • Spoon slightly more than half the plain batter into the bottom of the prepared Bundt pan. Add the chocolate batter ), followed by the remaining plain batter. Smooth top with offset spatula if needed.
  • Bake for 55-60 minutes or until a toothpick inserted into the center comes out clean. Let cook for about 10 minutes then release from pan to cool completely on wire rack.
  • To make glaze, melt remaining chocolate with corn syrup and heavy cream in the microwave for 1-2 minutes, stopping and stirring every 30 seconds till smooth and melted. Cool slightly. Place cake on the cooling rack over a baking sheet lined with parchment. Spoon glaze over cake.
  • Let glaze firm up at room temperature and serve.

Nutrition Information:



Serving Size:

1 slice

Amount Per Serving: Calories: 431Total Fat: 15gSaturated Fat: 8gTrans Fat: 0gUnsaturated Fat: 5gCholesterol: 65mgSodium: 371mgCarbohydrates: 72gFiber: 2gSugar: 45gProtein: 7g


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Tunnel of fudge cake Pinterest collage

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35 comments on “Tunnel of Fudge Cake {Tunnel of Doom Cake}”

  1. It’s so perfect and pretty. Amazing how perfect the two colours are – so neat and tidy! I really must get a cake tin like yours – I don’t have anything like it xx

  2. The crumb is perfectly moist and tender. YUM!

  3. The only thing scary about this Tunnel of Doom Cake is how much of it I could eat:@)

  4. Yummy ! 🙂 it looks so delicious, I will surely try these at home thanks for sharing and the pictures are also impressive 🙂

  5. I remember this cake from when I was a kid! Wow…*prints*! Thanks for sharing a great one! P~

  6. This looks so good! I could just eat a slice now with a cup of tea!

  7. Great way to start off Choctoberfest Liz and I love that during October it becomes the Tunnel of Doom!!

  8. Wow that is such a yummy looking cake. Love the glossy ganache on top.

  9. You know I struggle to get my family to eat desserts with nuts in, this cake would be perfect for them.

  10. This cake is almost too pretty to eat. Almost! 🙂

  11. This cake is SO pretty!

  12. “Tunnel of Doom”??? I’m sold. SO chocolatey and SO good!!

  13. Oh my gosh!! This looks perfect! I don’t think I’d want to cut into it for a minute. Then I’d devour it in a matter of seconds, lol. Love I.T 💕

  14. Be still my heart.. you had me at fudge! 🙂

  15. Tunnel of doom! Love it. My family is the same way about nuts, so this is perfect.

  16. What a lovely version of this classic cake! Love your presentation, too.

  17. That looks SO amazing! I tried a tunnel of fudge cake once, but it was chocolate cake and I must have messed up the recipe somehow. So I am really excited to try this recipe now that I have a little more experience baking 🙂 I’m sure it will turn out a lot better haha

    P.S. Thank you for always commenting on my posts – half the time I forget to reply back, but I really appreciate it and wanted to let you know! 🙂

  18. So pretty, so chocolatey! Can’t wait to bake.

  19. Bundt pan cakes are always popular and this one will be no exception, I’m sure.

  20. I haven’t had a tunnel of fudge cake in years. They were always so yummy and yours looks fantastic! I’d forgotten about this cake. I’ll have to make it – I know my family will love it!

  21. This cake looks absolutely amazing!! Thanks for sharing!!!

  22. This cake! I’d take that whole thing down in about five minutes flat. So delicious!

  23. This cake is gorgeous and the glaze is so perfect and glossy! It would be a hit around my house too!

  24. Cakes like this are classics for a reason. Why I’ve never made this before is a mystery and I intend to find out just how good this is. I’d have to bake it without the nuts also. My Gabbi would have a fit if she couldn’t have any of this.

  25. This is such a beautiful cake! *-*!

  26. This looks like a delicious cake and I love the surprise pattern inside.

  27. My prefer nut free desserts too, so I think they will enjoy this cake a lot. Thanks for sharing your recipe on Merry Monday. Pinned.

  28. this looks DELICIOUS! I  need to make this recipe ASAP for my family!!

  29. This is such a pretty cake! Everyone was so impressed and loved it! 

  30. Oh my goodness the presentation is perfect! Look delicious too! Beautiful cake that I can’t wait to try. 

  31. This cake is amazing!!! Such a fun title but the cake is one of a kind! That middle taste so good too!

  32. This was really amazing! Everyone at my house loved it! I can’t wait to make it again!

  33. This cake was the perfect ratio of chocolate and vanilla for me! I am a bundt cake fan to begin with and this is now on the top of my list. So delish!

  34. If the name alone doesn’t get you, the taste will! What a decadent treat!

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