Chocolate Rum Cupcakes with Chocolate Mousse Frosting | Cupcake Project

Never miss a recipe!

Subscribe now

Chocolate Rum Cupcakes with Chocolate Mousse Frosting

Home  »  Recipes  »  cupcakes  »  Chocolate Rum Cupcakes with Chocolate Mousse Frosting

Chocolate Rum Cupcakes

Sometimes cupcake recipes can go frosting-free, the cake a perfect dessert all on its own.  These chocolate rum cupcakes, however, should always be presented as a package deal with their chocolate mousse frosting.  The cake is heavy and almost bitter from blackstrap molasses and spiced rum.  When matched with the sweet and airy chocolate mousse frosting, the chocolate rum cupcakes take on a new identity, seeming sweeter than they actually are – the bitterness is masked and flavor subtleties shine through.

I could eat a full-sized chocolate rum cupcake without a problem, but in the spirit of New Year’s resolutions – and because these cupcakes are pretty intense – I made them as minis.  Of course, this also meant that I could comfortably have seconds when the complex, sophisticated flavor of these chocolate rum cupcakes left me urging for more.

If you've tried this recipe, please RATE THE RECIPE and leave a comment below!

Chocolate Rum Cupcakes
5 from 3 votes

Chocolate Rum Cupcakes with Chocolate Mousse Frosting

Servings 16 mini cupcakes


  • 1/2 cup unsalted butter room temperature
  • 1/4 cup blackstrap molasses
  • 1/4 cup + 2 tablespoons sugar
  • 1 ounce dark chocolate
  • 1 large egg
  • 1 large egg yolk
  • 1/2 teaspoon vanilla extract
  • 3 tablespoons sour cream
  • 1/2 cup all-purpose flour
  • 1/4 teaspoon salt
  • 1/4 teaspoon baking soda
  • 1/4 cup cocoa powder
  • 1/4 cup spiced rum
  • chocolate mousse frosting get the chocolate mousse frosting recipe
  • gold nonpareils optional


  1. Preheat oven to 350 F.
  2. In a medium-sized mixing bowl or the bowl of a stand mixer, mix butter, molasses, and sugar until fully combined.
  3. Melt the chocolate in the microwave or in a double boiler.
  4. Once the melted chocolate is cool enough to touch, add it to the butter mixture and mix until just combined.
  5. Mix in egg and egg yolk until just combined.
  6. Mix in vanilla and sour cream until just combined.
  7. Sift together flour, salt, baking soda, and cocoa powder into a separate medium-sized bowl. Use a fork or a whisk to ensure that the ingredients are mixed well after sifting.
  8. Add dry ingredients to wet ingredients in three additions, mixing until just combined after each addition.
  9. Mix in rum until just combined.
  10. Fill mini cupcake liners 2/3 full and put in the oven.
  11. Check for doneness at 12 minutes - a toothpick inserted into the center of a cupcake should come out clean. If they are not done, check again every three minutes until they are done.
  12. Immediately remove cupcakes from the cupcake tin and place on a cooling rack or on the counter to cool to room temperature.
  13. Pipe with chocolate mousse frosting.
  14. Optionally, roll the bottom edge of the frosting in gold nonpareils.


Love it? Share it!

13 comments on “Chocolate Rum Cupcakes with Chocolate Mousse Frosting”

  1. Christysays:

    Is the dark chocolate unsweetened? This recipe sounds very decadent and delicious.

  2. I just had my first rum cake and it was fantastic! I can’t wait to make these cupcakes!

  3. Cute! I love the design:).

  4. vex 3says:

    Thanks for your post! Through your pen I found the problem up interesting! I believe there are many other people who are interested in them just like me! Thanks your shared!… I hope you will continue to have similar posts to share with everyone!

  5. vex 3says:

    However, your post has given me a very special impression, unlike other posts. I hope you continue to have valuable articles like this or more to share with everyone!

  6. Wow! Easy recipe of Chocolate Rum cake,i will try at my kitchen as soon.Thanks for sharing!


  7. Yocakessays:

    I love cake, special when we celebrate any function, Thanks for sharing this chocolate rum cake. I’ll try.


  8. We all appreciate your post. Keep posting this kind of information.

    Thanks for sharing.

  9. Thanks Dee’s Bake Studio for the lovely chocolate cupcake.My son was happy that the cake was customised according to his wish.

  10. Thanks a lot for this beautiful chocolate rum cake.Keep up the good work.Cheers!

Show All Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Stay Connected!

Join my mailing list - and receive a free eBook!

Sign me up!
Next Post