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Irish Cream Mousse Cake

November 29, 2025 By Gretchen

Jump to Recipe Print Recipe

Irish Cream Mousse Cake for a stunning cake to impress just about everyone

Irish Cream Mousse Cake

Rich Chocolate Fudge brownies as the base for this cake

But you can use cake or a no bake cookie crust too!

Irish Cream Mousse Cake

 

Irish cream buttercream icing is completely optional

However the buttercream really added a perfect compliment to that rich deep triple chocolate
Whipped cream topping would be an equally delicious option!

Irish Cream Mousse Cake

Let’s talk about Irish Cream

Even though Bailey’s now makes a vegan Irish Cream I’ve made a homemade recipe anyway
It’s so incredibly easy and I saved a ton of money by doing it this way!

Irish Cream Mousse Cake

Substitutions & Notes for Success:

For those who cannot use alcohol in their baking I would suggest to use coffee or plant milk as a substitute

There are several options for vegan whipped cream nowadays
So whichever one you choose be sure to have enough for 2 cups fully whipped volume

To make a no bake crust for this mousse cake
Simply combine 1½ cups of your favorite cookie crushed up with 4 Tablespoons of melted vegan butter
Press it into the bottom of a spring form pan and refrigerate while you prepare the mousse recipe

WATCH THE VIDEO TUTORIAL FOR HOW TO MAKE THIS CAKE!

Irish Cream Mousse Cake

Homemade Irish Cream

Irish Cream Mousse Cake

Homemade Irish Cream

Print Recipe Pin Recipe
Prep Time 10 minutes mins
Cook Time 30 minutes mins
Total Time 10 minutes mins
Servings 1 ½ cups

Ingredients
  

  • Irish Whiskey 1/3 cup
  • Strong Brewed Coffee ¼ cup
  • Sugar of your choice/ Agave / Maple Syrup / Monkfruit:: ¼ cup
  • Almond Milk or your choice plant milk ¾ cup

Instructions
 

  • If using granulated sugar it is best to mix that first with the hot brewed coffee to dissolve
  • Then combine everything together in a jar and store in the refrigerator for up to 2 months
Tried this recipe?Let us know how it was!

For the Mousse Cake

Irish Cream Mousse Cake

Irish Cream Mousse Cake

Print Recipe Pin Recipe
Prep Time 30 minutes mins
Cook Time 30 minutes mins
Inactive Time 1 hour hr
Total Time 2 hours hrs

Ingredients
  

  • ½ Recipe Fudge Brownie

For the Irish Cream Mousse

  • Vegan Semi Sweet Chocolate Couverture 6 ounces approx 1 cup 168g
  • Raw Cashews 1 cup 150g
  • Irish Cream ¾ cup 177ml *see notes
  • Whipped Cream 2 cups whipped volume

For the Irish Cream Ganache

  • Vegan Semi Sweet Chocolate Couverture 4ounces approximately ¾ cup 113g
  • Plant Milk ¼ cup 60ml
  • Irish Cream 2 Tablespoons

For the Irish Cream Buttercream

  • Vegan Butter 2 sticks 226g
  • Confectioners Sugar 2 cups 240g
  • Salt ¼ teaspoon
  • Irish Cream 4 Tablespoons 60ml

Instructions
 

  • First prepare your 8" springform pan with parchment paper lining and a spray of pan spray
  • Preheat the oven to 350°F and prepare the brownie recipe as per the instructions on that post but you will bake it in an 8" springform pan
  • Once the brownie is completely cooled
  • Prepare the chocolate mousse by bringing the cashews to a rolling boil in approximately 1½ cups of water
  • Turn off the heat and let them soak for 30 minutes, then drain & rinse
  • Combine the warm cashews and room temperature Irish Cream together in a high speed blender and blend smooth
  • Melt the vegan chocolate in a large bowl then add the warm cashew/Irish Cream mixture and whisk smooth
  • Whip the vegan whipped cream to medium peaks then fold into the chocolate base only if the chocolate mixture is cool to the touch or you will melt the cream
  • Pour the Irish Cream Chocolate Mousse into the springform pan on top of the brownie base and then refrigerate until set approximately 3 hours or overnight
  • Prepare the Irish Cream Ganache by combining all the ingredients for the ganache in a small sauce pot and heat over low-medium heat whisking constantly until melted & smooth
  • Pour the warm ganache over the set mousse cake and refrigerate again to set completely
  • Meanwhile prepare the Irish Cream buttercream by whipping the room temperature vegan butter with the salt until fluffy with the paddle attachment of an electric stand mixer
  • Add the sifted confectioners sugar and mix smooth
  • Once all the sugar is incorporated, scrape the bottom & sides of the bowl and whip on high for 3 minutes
  • On low speed slowly add the Irish Cream 1 Tbs at a time until it is all incorporated
  • Pipe the buttercream onto the mousse cake as shown in the video tutorial
  • Use the excess ganache for a drizzle on each slice

Video

Notes

Irish Cream Mousse Cake must be kept refrigerated at all times and will stay fresh in the refrigerator covered loosely for up to 1 week
Freeze for up to 1 month
Tried this recipe?Let us know how it was!

Filed Under: All Recipes, Cake Recipes, Holiday Baking, Layer Cakes, Mousse Recipes

Previous Post: « English Muffins
Next Post: Vegan Grinch Cake »

Reader Interactions

Comments

  1. John

    March 14, 2022 at 3:05 am

    An especially wonderful thing about your recipes Gretchen is how many options you give people to take part in making one of your delicious plant based desserts. You rock.

  2. Tammy

    March 14, 2022 at 5:24 am

    You never cease to amaze me! This looks and sounds DELICIOUS!

  3. Brian

    May 7, 2022 at 11:31 pm

    Hi Gretchen, would it be possible to substitute the cashews for a different kind of nut like almond or something else? Thank you, the recipe looks amazing.

    • Brian

      July 14, 2022 at 6:52 pm

      I was able to find unsalted cashews and made this and it was absolutely amazing

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Yep, it's me Gretchen~ Owner of Gretchen's Bakery. Well, I no longer own a physical bakery since I sold mine in late 2014 & since 2016 I make nothing but the best vegan recipes! Read More…

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