Guinness Chocolate Mousse Cake

This Guinness Chocolate Mousse Cake has a layer of chocolate cake spiked with Guinness, a Guinness chocolate ganache layer in the middle and a Guinness chocolate mousse on top! There’s Guinness in every layer and it’s pure heaven!

Guinness Chocolate Mousse Cake

Guinness Chocolate Mousse Cake recipe

Guinness Chocolate Mousse Cake

If there’s one thing I don’t like, it’s beer. Never have I ever liked beer. Often times I want to like it – it’d be so much less expensive to get a drink out with dinner or with friends. In fact, last weekend the hubs and I were out with some friends and they all shared a bucket of beer – and I sat there with my fruity sweet mixed drink. That’s how I roll. 🙂

But despite my serious distaste for beer, I LOVE the flavor it gives food! Weird, right?! The hubs and I were watching football last Sunday and I decided to whip us up a good cheese dip and what did I add? BEER! And a good bit of it too. The hubs’ favorite part was all the beer flavor and we devoured it. There are few things better than beer cheese, but you know what one of them is? I bet you can guess. 😉

That’s right! This cake! You guys, if you’ve never had Guinness and chocolate together you are missing out. Pure. Heaven.

Best Guinness Chocolate Mousse CakeBest Guinness Chocolate Mousse Cake

This cake is actually another one from my cookbook. I promise I won’t be sharing the whole book on the blog. Just a few and a bit of a sampling.

One of the things I used a few times in the book was mousse. Mousse cakes actually remind me of my younger brother. If he wasn’t eating an ice cream cake as a kid, he was eating chocolate mousse. Not with Guinness, but still. I’ve even got a cupcake in the book that includes a mousse topping. I love the light and fluffy texture and the smooth-ness it adds to a cake.

Tips for Making Guinness Chocolate Mousse Cake

There is a recipe in the book that uses a more traditional mousse with cooked eggs, but this one uses gelatin. If you’ve never used gelatin, do not be afraid. It isn’t nearly as scary as it seems. You want to sprinkle it over cold water to let it “bloom,” then heat it up to activate it. As it cools, it gets all gelatin-y and firms up the mousse. In this case, it’s added to warm cream before being poured over the chocolate for the mousse. No problem, right? You totally got this.

Guinness Chocolate Mousse Cake - from the cookbook Simple Beautiful Homemade Cakes! So good!Guinness Chocolate Mousse Cake overhead view

The cake can be layered together in two ways. I mention the options in the instructions below, but one option is to use cake collars. I started using them when writing the book because they really just are easier to use. However, if you don’t want to bother with them, you can use the same 8 inch pan you bake the cake in. I’d recommend either an 8×3 inch regular pan or an 8×3 inch springform pan. I like to lay clear wrap over the bottom of the pan, sticking up on the sides, then add a cardboard cake circle, then build a mock collar with parchment paper. The taller sided pan helps keep the parchment paper standing up straight. Then you build the cake in the pan just as if you were using a clear cake collar.

Once the cake is done and ready for decorating, there are many options. I decorated the one in the book a little differently, but this time around decided to add some piped roses. I love the final look! Beer and roses – what’s not to love? 🙂

Besides like I said, Guinness and chocolate were basically made for each other in baked goods. This cake is SO good and is definitely one you need to try!

Easy Guinness Chocolate Mousse CakeDecorated Guinness Chocolate Mousse Cake

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full image of Guinness Chocolate Mousse Cake

Guinness Chocolate Mousse Cake

  • Prep Time: 35 minutes
  • Cook Time: 35 minutes
  • Total Time: 1 hour 10 minutes
  • Yield: 12-14 Slices
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


This Guinness Chocolate Mousse Cake has a layer of chocolate cake spiked with Guinness, a Guinness chocolate ganache layer in the middle and a Guinness chocolate mousse on top! There’s Guinness in every layer and it’s pure heaven!



  • 6 tbsp (84g) unsalted butter, room temperature
  • 1 cup (207g) sugar
  • 6 tbsp (86g) sour cream, room temperature
  • 1/2 tsp vanilla extract
  • 1 large egg, room temperature
  • 1 large egg white, room temperature
  • 1 cup (130g) all purpose flour
  • 6 tbsp (42g) Hershey’s Special Dark Cocoa
  • 1/2 tsp baking powder
  • ¼ tsp salt
  • 1/2 cup (120ml) Guinness beer, room temperature


  • 1 1/4 tsp unflavored powdered gelatin
  • 1 1/2 tbsp (23ml) water, room temperature
  • 10 oz (284g or 1 2/3 cup) semi sweet chocolate chips
  • ½ cup (120ml) Guinness beer, room temperature
  • 1 3/4 cups (420ml) heavy whipping cream, cold, divided
  • 1 tsp vanilla extract
  • 1/2 cup (58g) powdered sugar


  • 4 oz (114g or 2/3 cup) dark chocolate chips
  • 2 tbsp (30ml) heavy whipping cream
  • 2 tbsp (30ml) cup Guinness


  • ½ cup (120ml) heavy whipping cream, cold
  • 1 tbsp (7g) Hershey’s Special Dark Cocoa
  • 2 tbsp (15g) powdered sugar
  • ¼ tsp vanilla extract



1. Preheat the oven to 350°F (176°C). Line the bottom of an 8-inch (20cm) cake pan with parchment paper and grease the sides.
2. In a large mixing bowl, cream the butter and sugar together on medium speed until light in color and fluffy, 3-4 minutes.
3. Add the sour cream and vanilla extract and mix until combined.
4. Add egg and egg white in two batches and mix until incorporated. Scrape down the sides of the bowl as needed to make sure everything is combined.
5. Combine flour, cocoa powder, baking powder and salt in a medium bowl.
6. Add half of the flour mixture to the batter and mix until combined. Add Guinness to the batter and mix until combined. Scrape down the sides of the bowl as needed to ensure everything is being combined. Add the remaining flour mixture and mix until smooth.
7. Pour the batter into the prepared cake pan. Bake for 33-36 minutes, or until a toothpick inserted in the middle comes out with a few crumbs.
8. Remove cake from the oven and allow to cool for 2-3 minutes, then remove to cooling rack to finish cooling.
9. Once it has cooled, use a large serrated knife to remove the dome off the top so that it’s flat.


10. Once the cake is cool, make the mousse. In a small bowl, sprinkle the powdered gelatin over the water, making sure the powder is mostly touching water. Let stand for about 5 minutes.
11. Place the chocolate chips in a medium glass bowl.
12. Microwave the Guinness and 1/4 cup (60ml) of heavy cream in a medium measuring cup until it comes to a boil.
13. Add the gelatin mixture to the hot heavy cream mixture and whisk until the gelatin is dissolved.
14. Pour the hot cream over the chocolate chips and let sit, covered, for about 5 minutes.
15. Whisk the chocolate mixture until the chocolate is melted and the mixture is smooth. Set aside to cool to about room temperature.
16. Whip remaining 1 1/2 cups (360ml) of heavy cream, powdered sugar and vanilla extract with a mixer fitted with the whisk attachment until stiff peaks form.
17. Gently fold about a third of the whipped cream into the cooled chocolate mixture until combined. Add the second third of the whipped cream and gently fold into the chocolate mixture. Add the remaining whipped cream and fold together until completely combined. Set the mousse aside.


18. To make the ganache filling, place the chocolate chips in a small glass bowl.
19. Microwave the heavy whipping cream and Guinness in a medium measuring cup until it comes to a boil.
20. Pour the hot cream over the chocolate chips and let sit, covered, for about 5 minutes.
21. Whisk the chocolate mixture until the chocolate is melted and the mixture is smooth.


22. To put the cake together, you can use one of two methods. The first would be to use a plastic cake collar. You can usually buy them online. If using this method, begin layering the cake by wrapping the collar around the cake layer and securing it in place. The other method would be to build the cake in an 8 inch (20cm) cake pan or 8 inch (20cm) springform pan. I recommend an 8×3 inch pan so it’s a little taller. Place some clear wrap in the bottom of the pan, extending up the sides (to remove the cake from the pan later). Use parchment paper to create a mock collar, then add the cake layer to the pan.
23. Spread the ganache filling into an even layer on top of the cake layer.
24. Spread the mousse into an even layer on top of the ganache.
25. To create the pattern on top of the cake, use the rounded end of a 9 inch (23cm) offset spatula. Lightly press the spatula into the top center of the mousse. Keeping the spatula lightly pressed against the mousse, use a turntable to spin the cake and slowly move the spatula to the outside of the cake, creating a spiral.
26. Place the cake into the fridge to cool and firm, about 5-6 hours.
27. Once the cake is firm, remove it from the refrigerator. If you used a plastic cake collar, carefully peel it off. If you used a cake pan with parchment paper, use the plastic wrap to lift the cake out of the pan, then peel off the parchment paper. If needed to smooth the sides of the cake, use a warm offset spatula to gently smooth out the sides.
28. To make the whipped cream, whip the heavy cream, cocoa, powdered sugar and vanilla extract at high speed with the whisk attachment until stiff peaks form.
29. Pipe several large roses along the outside edge of the cake. Pipe some additional little flowers and add some sprinkles, if desired.

Store the cake (in an airtight container, if possible) in the refrigerator until ready to serve. Cake is best for 2-3 days.


Excerpted from Simply Beautiful Homemade Cakes: Extraordinary Recipes and Easy Decorating Techniques by Lindsay Conchar. Copyright © 2016. Reprinted with permission from Page Street Publishing Co. All rights reserved.


  • Serving Size: 1 Slice
  • Calories: 473
  • Sugar: 36.6 g
  • Sodium: 74.7 mg
  • Fat: 29.9 g
  • Carbohydrates: 48.2 g
  • Protein: 5.9 g
  • Cholesterol: 74.3 mg

Keywords: mousse cake, chocolate mousse cake recipe, moist chocolate cake recipe, homemade chocolate cake recipe, how to make chocolate cake, how to make chocolate cake from scratch, guinness chocolate cake, moist chocolate cake recipe, the best chocolate cake

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Guinness Chocolate Mousse Cake - from the cookbook Simple Beautiful Homemade Cakes! So good!

Guinness Chocolate Mousse Cake - from the cookbook Simple Beautiful Homemade Cakes! So good!

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  1. Brenda Milcetic

    Hi Lindsay,
    Your cake looks amazing!!! Making it for my husband’s birthday. What # of Wilton piping tip did you use?
    Thank you,

  2. Fiona

    Hi! I’m a vegetarian, so I don’t eat gelatin and I was wondering if a different mousse recipe could be used? I really want to make this cake for my birthday next week…

    1. Lindsay

      I’m not sure if this would work without the gelatin or not, but you could try it. Otherwise, another recipe might be ok.

  3. Michelle

    Hi lindsay
    The cake sounds n looks awesome. Can i replace Guinness with some other beer? Maybe lager beer?? This brand isn’t available here.

    1. Lindsay

      I would think that’d be fine. Guinness is a very dark and almost thick beer, so you might want something like that.

  4. Tessa

    Hi Lindsay! How do you perfectly positioned the rosettes on top of the cake? I always have trouble with that and I end up with either one bigger or smaller in size 🙁

    1. Lindsay

      That happens to me sometimes too. 🙂 One trick that can help is to mark the spots with a little toothpick dot or something so you have the general spacing and number of rosettes marked out.

    1. Lindsay

      I certainly hope you can taste the guinness. A true Guinness lover might think it isn’t strong enough though. 🙂 Though I haven’t tried it without the Guinness, you should be able to swap it out for milk in the cake. For the mousse, I’d refer to the chocolate mousse layer of this cake. In the ganache, replace it with more heavy cream.

      1. Sam

        So replace half a cup of the beer with half a cup of milk if you want the “virgin” chocolate mousse cake? ????

  5. Alison Haveman

    I have made a cake with Guinness before and it was delicious. Now I will need to try this one! The flavor from the Guinness takes it over the top!

  6. Ann

    It looks beautiful with the large roses! I really admire your cake decorating skills.
    One question : what icing tip did you use to pipe the roses? TIA!

About Lindsay

I'm a wife and a mom to twin boys and a baby girl! And I've got a serious sweets addiction! Bring on the treats!

Scripture I’m Loving

“Come to me, all you who are weary and burdened, and I will give you rest. Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls.” Matthew 11:28-29