Decadent Diet Birthday Cake – Black Magic Cake

My girlfriend from grade school is on a diet and she’s doing spectacularly well so I don’t want to hinder her progress. But, it’s her birthday and we like to celebrate our birthdays with chocolate cake.

When we were kids, my mother decorated one of my birthday cakes on a budget… she used Smarties. From that day on, when invited to my birthday parties, my friends would always ask anxiously if my mother was making chocolate cake with Smarties on it, again this year. Thus a tradition got started.

Getting back to my girlfriends birthday cake, I had a choice… to make Pamela a chocolate cake that would only add temptation to break her progress (not a choice!)… or make her cupcakes instead.

Cupcakes won out because they can be frozen for later use… thus my title “Decadent Diet Birthday Cake.”

How else was I going to be able to make this heavenly Black Magic Chocolate Cake for her birthday!

Ingredients

1 cup of butter
¾ cup chocolate syrup
10 – 52g Mars chocolate bars – cut up in chunks
2 cups white sugar
1 cup milk (add one tablespoon of vinegar)
1 teaspoon vanilla
4 eggs
2 ½ cups of all-purpose flour
¾ cup unsweetened cocoa
¾ teaspoon salt
½ teaspoon baking soda

Directions

  1. Preheat oven to 325° F
  2. Line your muffin tins with cupcake papers.
  3. In a microwave-safe bowl, combine the butter, syrup, and Mars bars. Heat 3 to 4 minutes whisking once. Whisk until smooth.
  4. Whisk in sugar, milk (with the one tablespoon of vinegar – I used cider vinegar though you could substitute all with buttermilk), vanilla and lightly beaten eggs.
  5. Spoon batter into cupcake wrappers, stopping approximately ¼” below top of the cupcake paper.
  6. Bake for about 30 minutes or until a toothpick inserted in center comes out almost clean.
  7. Cool in pan on a wire rack for about 10 minutes, then remove and finish cooling on rack.
  8. Add your favourite icing and sprinkles and your ready to serve.

Makes approximately 4 dozen cupcakes …or 2 dozen cupcakes and 1 small cake.

If you prefer to use the entire recipe for cake, be sure to use a bundt cake pan and grease it well. Once cooked, cool the cake pan on a rack for 10 minutes before trying to remove it from the pan.

Don’t have a bundt cake pan? Try Cake Pan Size Conversions.

47 Responses to Decadent Diet Birthday Cake – Black Magic Cake
  1. Elda Reply

    i really appreciate sharing this great recipe. keep up the great work!

  2. Charles Berti Reply

    i should definitely print your recipe… thanks!

    • Trish Reply

      You are very welcome Charles!

  3. Clenira Reply

    This has to be the best recipe for chocolate cake ever. Thanks!

    • Trish Reply

      I think so too Clenira… :-)

  4. Adrize Reply

    Thanks to you i have learned something new today. My girlfriend can have her cake and eat it too. LOL!

    • Trish Reply

      I'm glad for you Adrize!

  5. Farah Reply

    awesome recipe, thanks!

  6. Edelina Reply

    nice recipe!

  7. Augusta Reply

    very nice recipe. good job. keep it up these types of recipes and I’ll never lose weight. lol

    • Trish Reply

      LOL, I hear ya' Augusta!

  8. Jordan Reply

    OMG, this recipe sounds heavenly!

    • Trish Reply

      It IS heavenly Jordan. You'll LOVE it, I'm sure!

  9. Aida Reply

    thanks for this recipe i like it!

  10. Celina Reply

    really nice recipe, thanks!

  11. Adelina Reply

    a cool sounding recipe!

  12. Cecel Reply

    Yummy… thanks for this one!

  13. Deusete Reply

    excellent recipe, thank you very much!

    • Trish Reply

      Glad you enjoyed this one Deusete . It's one of my favourites!

  14. Anick Reply

    thanks! great recipe!

    • Trish Reply

      You're welcome Anick!

  15. Araci Reply

    great website, great recipe. i will also encourage my friends to read your blog

  16. Edgard Reply

    This is a fantastic recipe, thanks!

    • Trish Reply

      You're very welcome Edgard!

    • Nurkholis Reply

      Absolutely precious recipe!

      • Trish Reply

        Hope you enjoy it as much as we did Nurkholis!

  17. Jordan Reply

    Wow, surprisingly I never ever knew you could use chocolate bars in cakes like this. I’ve been reading through your blog a lot these past few days and it’s earned a spot in my bookmarks. Well done!

    • Trish Reply

      Thanks Jordan!

    • Maria Eklund Reply

      You’re recipe sounds amazing!

  18. Claudirene Reply

    A friend recommended your website to me, he said that your posts are the best. He was right, this is one very yummy recipe!

    • Trish Reply

      Thanks Claudirene!

    • Deonte Reply

      Here’s one I can share with you:
      Chocolate oreo cake – What you need is 1 pkg. (2-layer size) devil’s food chocolate cake mix, 4 squares BAKER’S Semi-Sweet Chocolate, 1/4 cup (1/2 stick) butter, 1 pkg. (8 oz.) PHILADELPHIA Cream Cheese softened, 1/2 cup sugar, 2 cups Cool Whip Topping, 12 Oreo Cookies, coarsely crushed. HEAT oven to 350 degrees F. Prepare cake batter and bake in 2 9-inch round cake pans as directed on mix package. Once cooked, cool in pans 10 min. Invert cakes onto wire racks; gently remove pans. Cool cakes completely. Microwave the chocolate and butter in a small microwaveable bowl, on high for 2 min. or until butter is melted. Stir until chocolate is completely melted. Cool 5 min. Meanwhile, beat cream cheese and sugar in large bowl with mixer until blended. Gently stir in Cool Whip and crushed Oreo cookies. Stack cake layers on plate, spreading cream cheese mixture between layers. Spread top with chocolate glaze. Let stand until firm. Keep refrigerated. This great-tasting cake will now look like a giant OREO Cookie. If chocolate glaze becomes too thick, microwave it on high for about 20 to 30 seconds or until you get the desired consistency. Enjoy a serving of this indulgent cake on occasion, but keep your portion size in mind.

  19. Trish Reply

    I enjoyed making these for my special best friend too {{{HUGS!}}}

    • Johann Reply

      Just the same as a pinch of salt or sugar will enhance food, so too can coffee if/when added to chocolate. MOCHA-CHOCOLATE is also very much the vogue, as both flavours compliment whilst neither one being overpowering. Rather than say plain milk or water, coffee has been substituted and why not? If you want an intense chocolate flavour, however, then do not add any coffee. Use ONLY cocoa and a good dark chocolate of no less then 70%.

    • Sue Reply

      Thanks for this one!

      • Trish Reply

        You're very welcome Sue!

  20. Pamela Reply

    This is the prefect recipe to show your Girlfriends that you care with Chocolate.The best mini cakes I have ever had. Trish made these for my B-day and they took me back to the birthday parties when I was a Child.

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