Go Back
Tunnel Of Fudge Bundt Cake

Tunnel of Fudge Bundt Cake Recipe

Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 1 hour
Total Time 1 hour 20 minutes
Servings: 12 servings
Calories: 420
Ingredients Method Notes

Ingredients
  

  • 2 cups all-purpose flour
  • 1 1/2 cups granulated sugar
  • 3/4 cup unsweetened cocoa powder
  • 1 1/2 tsp baking powder
  • 1/2 tsp baking soda
  • 1/2 tsp salt
  • 1 cup buttermilk, room temperature
  • 3 large eggs, room temperature
  • 1/2 cup unsalted butter, softened
  • 2 tsp vanilla extract
  • 1/2 cup granulated sugar (for filling)
  • 1/4 cup unsweetened cocoa powder (for filling)
  • 1/4 cup unsalted butter, cut into pieces (for filling)
  • 1/4 cup hot water
  • 1/2 cup semi-sweet chocolate chips
  • 3/4 cup chopped walnuts (optional)

Method
 

  1. Preheat oven to 350°F (180°C). Whisk flour, 1 1/2 cups sugar, 3/4 cup cocoa, baking powder, baking soda, and salt. Add softened butter, buttermilk, eggs, vanilla. Beat 2 minutes until thick and smooth.
  2. For filling, microwave filling sugar, cocoa, butter pieces, hot water, and chocolate chips in bursts, stirring, until smooth. Stir in walnuts if using. Let cool 5 minutes.
  3. Grease a 10 to 12-cup bundt pan. Spread half the batter in pan. Spoon filling over batter, leaving a border. Top with remaining batter and gently swirl with a knife to create ribbons.
  4. Bake 55 to 60 minutes, until a toothpick inserted into the cake part comes out with moist crumbs. Center will look soft. Cool in pan on a rack for 15 minutes.
  5. Run a knife around edges, invert onto a rack, and cool completely. Slice and serve.

Notes

The cake needs to cool in the pan for 15 minutes before turning out, and then cool fully on a rack for about an hour. That cooling time is not included in the prep or cook times above. For the cleanest slices, use a serrated knife and wipe it between cuts.