3 chocolate cupcakes iced and decorated with Smarties used as a header image

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.

About the Author Trish

Given my passion for genealogy, is it any wonder that I eventually wanted to publish my work? Learning to use a personal computer was a natural step once I was introduced it in the 1990s. Then the internet offered a second means to "publish" and now, here I am with a personal blog.

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Leave a Comment:

47 comments
Elda says July 17, 2012

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

Reply
    Trish says July 21, 2012

    Thanks Elda!

    Reply
Charles Berti says July 2, 2012

i should definitely print your recipe… thanks!

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    Trish says July 2, 2012

    You are very welcome Charles!

    Reply
Clenira says June 27, 2012

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

Reply
    Trish says June 27, 2012

    I think so too Clenira… 🙂

    Reply
Adrize says June 22, 2012

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

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    Trish says June 23, 2012

    I'm glad for you Adrize!

    Reply
Farah says June 16, 2012

awesome recipe, thanks!

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    Trish says June 20, 2012

    You're welcome Farah!

    Reply
Edelina says June 12, 2012

nice recipe!

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    Trish says June 14, 2012

    Thanks Edelina!

    Reply
Augusta says May 28, 2012

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

Reply
    Trish says May 28, 2012

    LOL, I hear ya' Augusta!

    Reply
Jordan says May 27, 2012

OMG, this recipe sounds heavenly!

Reply
    Trish says May 28, 2012

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

    Reply
Aida says May 18, 2012

thanks for this recipe i like it!

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Celina says May 8, 2012

really nice recipe, thanks!

Reply
    Trish says May 8, 2012

    You're welcome Celina!

    Reply
Adelina says May 6, 2012

a cool sounding recipe!

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    Trish says May 8, 2012

    Thanks Adelina!

    Reply
Cecel says April 30, 2012

Yummy… thanks for this one!

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    Trish says May 8, 2012

    You're welcome Cecel!

    Reply
Deusete says April 27, 2012

excellent recipe, thank you very much!

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    Trish says April 28, 2012

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

    Reply
Anick says April 25, 2012

thanks! great recipe!

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    Trish says April 28, 2012

    You're welcome Anick!

    Reply
Araci says April 21, 2012

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

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    Trish says May 8, 2012

    Thanks Araci!

    Reply
Edgard says April 20, 2012

This is a fantastic recipe, thanks!

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    Trish says May 8, 2012

    You're very welcome Edgard!

    Reply
    Nurkholis says May 18, 2012

    Absolutely precious recipe!

    Reply
      Trish says May 18, 2012

      Hope you enjoy it as much as we did Nurkholis!

      Reply
Jordan says March 26, 2012

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!

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    Trish says May 8, 2012

    Thanks Jordan!

    Reply
    Maria Eklund says May 18, 2012

    You’re recipe sounds amazing!

    Reply
      Trish says May 18, 2012

      Thanks Maria!

      Reply
Claudirene says March 16, 2012

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

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    Trish says May 8, 2012

    Thanks Claudirene!

    Reply
    Deonte says May 16, 2012

    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.

    Reply
      Trish says May 18, 2012

      Wow, thanks Deonte!

      Reply
Trish says February 21, 2012

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

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    Johann says May 16, 2012

    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%.

    Reply
      Trish says May 18, 2012

      Thanks Johann!

      Reply
    Sue says May 18, 2012

    Thanks for this one!

    Reply
      Trish says May 18, 2012

      You're very welcome Sue!

      Reply
Pamela says February 16, 2012

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.

Reply
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