Black Onyx Bundt Cake

5 from 7 reviews


Units Scale
  • 1/2 box dark chocolate cake mix
  • 1 cup club soda
  • 1/4 cup chopped extra dark bitter chocolate
  • 1/2 cup white chocolate melting candies
  • Black & Silver sprinkles


  1. Preheat oven to 350 degrees F. Grease three mini bundt molds and set aside.
  2. In a large bowl whisk cake mix and seltzer until a smooth batter forms. Fold in chopped chocolate.
  3. Divide the batter between the bundt molds and sprinkle with black and silver sprinkles.
  4. Bake for 12-15 minutes until cake tester comes out clean.
  5. Let cool before removing form the cake pan. Turn out onto a cake plate.
  6. Melt down white chocolate melting candies and drizzle liberally with white chocolate and sprinkle with more black and silver sprinkles. Let the chocolate drizzle set before serving.


I used the convection setting on my oven for this recipe. Adjust the cook time to your oven. On convection at 350 degrees F. these cakes were done in about 12-15 minutes for me.

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