Homemade Brownie Soap Recipe

12 Materials
1-2 Hour
This homemade brownie soap recipe is made with fresh strong brewed coffee, unsweetened cocoa powder and an entire egg for a luxurious feeling soap with a rich, thick lather. Makes a great housewarming gift!
Egg in soap? Really?! Yes, absolutely! Eggs are believed to offer many skin care benefits including tightening skin, shrinking pores, and calming redness and breakouts. When you use egg in cold process soap, the egg yolks are treated as a fat. This gives the soap a rich, thick lather. Egg whites, on the other hand, don't contain fat. However, they do contain protein which has an astringent effect on skin.
To make this soap, you should be familiar with the cold process soapmaking method. If you aren't, you can find my basic cold process soapmaking instructions at Soap Deli News blog here.

If you've never made cold process soap before - or any kind of soap in which you're working with lye - I strongly recommend you start with a beginner soap recipe so you get a feel for the process and know you can create a successful soap.

You can find the recipe for making this brownie inspired soap along with additional soapmaking notes and recommendations at Soap Deli News blog here. So be sure to head over once you're ready to make this amazing, luxurious soap!

You'll begin by brewing some extra strong coffee to mix with your lye. The coffee is substituted for what is typically the water in a cold process soap recipe.

You'll need to allow you coffee to cool. At the same time, you should remove an egg from the fridge and allow it come to room temperature.
Weigh out the lye and slowly pour into the coffee in a well ventilated area. Stir until the lye has completely dissolved, then set the coffee/lye mixture aside to cool.
Now weigh out the soapmaking oils for this recipe using a digital scale. For my brownie soap recipe I used a combination of babassu oil, castor oil, unrefined cocoa butter, refined coconut oil, olive oil and safflower oil. Heat the oils until they melt then set them aside to cool as well.

Once your lye/water and soapmaking oils have cooled to room temperature or around 76°F you're ready to make soap.

Use a measuring spoon, measure out sodium lactate and stir it into your lye-coffee. The sodium lactate helps to make a harder bar of soap.

Then you'll need to temper your egg. It is important to start with a room temperature egg. Tempering your egg prevents you ending up with what looks like scrambled egg in your soap.

To temper the egg, remove about a cup of oil from your soapmaking oils then whisk the entire egg (no shell, of course) into the oils. (No! The egg won't cause the finished soap to go bad! In fact, it lasts just as long as regular cold process soaps that don't contain egg.)
Using measuring spoons, measure out the unsweetened cocoa powder for your soap. I recommend using a stick blender to incorporate the cocoa powder into the oils.

You can now return the oil with the egg mixed in back with the remaining oils. Briefly mix again.
Now pour the lye/coffee into the soapmaking oils. Mix the soap with a stick blender until you reach trace.

If you’re using a fragrance oil, add it at light trace and keep mixing until the soap batter is like a light pudding. (I didn't use a fragrance and it still smelled like chocolate!)

Pour the soap batter into a round mold. I used a round silicone with six cavities.
If desired, you can add whole coffee beans to the top of each of your soaps as an accent.

Allow your soap to set up for at least 48 hours before unmolding. If your soap doesn’t seem like it’s going to come out of the mold easily – especially if it didn’t gel – you can place the mold in the freezer for about a half hour or simply wait an extra day or two.
Because it’s winter and much colder in my house right now, I got soda ash on the tops of my soaps. However, I loved the contrast between the color of the soda ash and the color of the soap and the coffee beans so I left it on my soaps. If you don’t like the way it looks, you can simply steam or wash it off. Or add piped soap to the tops!

Be sure to allow your soaps to cure four to six weeks before using.
Suggested materials:
  • Babassu oil
  • Castor oil
  • Unrefined cocoa butter
See all materials
Rebecca D. Dillon
Want more details about this and other DIY projects? Check out my blog post!
Frequently asked questions
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  • Tami Chrisman Tami Chrisman on Feb 23, 2017
    Soda Ash? did that happen naturally or did you place it on top? I'm not familiar with soap making at all but absolutely love these.

  • Bryan Bryan on Jul 28, 2020

    Is this why children eat tide pods?

  • Monique Celestin Monique Celestin on Jan 22, 2022

    Why is there no measurements or basic cost effective window...how long will this product last after making wrapped or unwrapped..thanks

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