Tunnel of Fudge Cake {Tunnel of Doom Cake}

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.  Thanks to our generous gold sponsor for Choctoberfest, Imperial Sugar, for providing sugar for my recipes this week. I was not compensated for writing this post.

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

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

The Origin of this 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 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 one with a 10-15 cup capacity.

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



Today is one of my favorite days of the year, because it is the official start of #Choctoberfest. This is the third annual food blogger celebration of all things chocolate, made possible thanks to our gold sponsor Imperial Sugar and the other sponsors listed below.

Over 70 bloggers are participating in #Choctoberfest 2017 and will be posting 200+ chocolate recipes over the next week. Keep your eyes peeled, visit any of the blogs listed below, or use the #Choctoberfest hashtag on Instagram, Twitter, and Facebook to follow along. You can also check out our #Choctoberfest Pinterest board, where we post chocolate recipes all year long.

You can also enter to win our #Choctoberfest prize packUPDATE: The giveaway has ended and the entry form is no longer in this post.

Thank to our amazing sponsors who are contributing the following items for the prize:

  • $100 gift card to Williams Sonoma or Sur La Table from our gold sponsor Imperial Sugar
  • 1 case of granulated white sugar (40 pounds), 1 case of light brown sugar (24 pounds), 1 case of dark brown sugar (24 pounds), and 1 case of powdered sugar (24 pounds) from our gold sponsor Imperial Sugar
  • 16 oz Barlean’s Butter-Flavored Coconut Oil, 9.52 oz canister of Chocolate Silk Greens, and 8oz bottle of Essential Women Omega-Swirl Chocolate Mint from our silver sponsor Barlean’s
  • 300-piece Lindt LINDOR Truffles gift bag (you choose the flavors!) from blog sponsors The PinterTest Kitchen

This prize pack is valued at over $450! To enter, simply follow participating sponsors and bloggers using the below giveaway widget.


Choctoberfest logoStay tuned to see the delicious recipes bloggers have cooked up using Imperial Sugar and Barlean’s products. Thank you also to Davis Chocolate and Rodelle for being #Choctoberfest shoutout sponsors! Watch Instagram and Facebook to find out more about about their chocolate products.

Here is a complete list of all the bloggers participating in #Choctoberfest 2017, so you can see the recipes they are posting throughout the week:

The PinterTest KitchenFix Me a Little LunchSavory MomentsCrumbs in my MustachioHouse of Nash EatsBake It With LoveThat RecipeHardly A GoddessCooking With CarleeA Kitchen Hoor’s AdventuresBody RebootedCindy’s Recipes and WritingsThe Redhead BakerFaith, Hope, Love, & Luck Survive Despite a Whiskered AccompliceSweet CoraliceSeduction in The KitchenCooks&Books&RecipesEveryday EileenUnder My Apple TreeFamily Around The TableBottom Left of the MittenThe Spiffy CookieFairyburgerJoin Us, Pull up a ChairJonesin’ For TasteJane’s Adventures in DinnerTake Two TapasJennifer BakesThe Unlikely BakerHostess At HeartKaren’s Kitchen StoriesKate’s Recipe BoxKelly Lynns Sweets and TreatsWildflour’s Cottage KitchenChocolate SlopesLittle House Big AlaskaMakes, Bakes and Decor2 Cookin Mamas ♥ That Skinny Chick Can Bake ♥ Books n’ CooksMildly MeanderingLiving IdeasRestless ChipotleGet the Good Stuff!The Weekday GourmetAn Affair from the HeartWest Via MidwestCookie Dough and Oven MittThe Bitter Side of SweetCookaholic WifeDaily Dish RecipesFor the Love of FoodThe Saucy SouthernerCook’s HideoutBy the PoundsTramplingrose: Cooking, Baking & Ranting in Small-Town South DakotaSarah Cooks the BooksChef Sarah ElizabethFantastical Sharing of RecipesSarah’s Bake StudioThe Pajama ChefFrankly EntertainingLong Distance BakingPalatable PastimeThe Freshman CookThe Food Hunter’s Guide to Cuisine ♥ A Day in the Life on the FarmWendy PolisiTampa Cake GirlMy Southern Sweet ToothCanning and Cooking at HomeFull Belly SistersSuperSizeGuy.comOur Good LifeThe Life Jolie ♥

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


Tunnel of Fudge Cake {Tunnel of Doom Cake}

Serves 12     adjust servings

Prep Time 30 mins
Cook Time 1 hour
Total Time 1 hr 30 mins




  • 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.


Recipe Notes


Nutrition Facts
Serving Size 1 slice
Amount Per Serving As Served
Calories 630kcal Calories from fat 339
% Daily Value
Total Fat 38g 58%
Saturated Fat 23g 115%
Transfat 1g
Cholesterol 122mg 41%
Sodium 363mg 15%
Carbohydrate 71g 24%
Dietary Fiber 2g 8%
Sugars 45g
Protein 7g

Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs:

Calories 2000
Total Fat Less than 65g
Sat Fat Less than 25g
Cholesterol Less than 300mg
Sodium Less than 2,400mg
Total Carbohydrate 300g
Dietary Fiber 25g
Tunnel of Fudge Cake | A rich butter cake with a fudgy ribbon in each slice. Make for Hallloween as a Tunnel of Doom Cake!
Did you make this recipe?
Leave review!

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



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