Spooky Brownie Bottom Mousse Cake

The creamiest chocolate mousse (made super easy with only 3 ingredients!) with a rich and fudge brownie crust. Serve as-is, or top with the cutest little whipped cream ghosts for some Halloween fun!

This post is sponsored by Eagle Brand Milk, but as always, all thoughts and opinions are my own. Thank you for supporting the brands that make Buuck Farms Bakery possible.

Ooohhh how I love Halloween. But not in the scary, horror movie kind of way. In the cute costume, kids party, pumpkin patch and hay rides kind of way. We throw a Halloween party out on the farm every year for the kiddos and it’s always such a fun time. We paint pumpkins, decorate sugar cookies, do trunk or treat, and have hay rides. And of course, me being the hostess that I am, love to whip up all the fun treats for the kids and the parents.

I love a Halloween themed dessert, that’s less in your face. More subtly themed and pretty, just like this Spooky Brownie Bottom Mousse Cake. It’s so easy to whip up, and includes the best 3 ingredient hack on chocolate mousse thanks to a can of Eagle Brand Sweetened Condensed Milk. Let’s get to it!

How to Make Spooky Brownie Bottom Mousse Cake

Make the Brownie Crust

Preheat the oven to 350 and line a 9X13 pan with parchment paper. I recommend leaving an overhang with the parchment paper so that the cake can be easily lifted out of the pan when you’re ready to slice and serve.

In a large bowl, whisk together the melted butter and sugars until well combined, 1-2 minutes. Then, add the egg and vanilla and whisk for about 3 minutes, until the mixture becomes smooth and lightened in color. Add the flour, cocoa powder, espresso powder, and salt. Fold together with a rubber spatula until just combined. Fold in the chocolate chips.

Pour brownie batter into the prepared pan and use an offset spatula to spread into an even layer. They will be thinner than a typical batch of brownies, but that’s what we want since this is the crust! Bake at 350 for 15 minutes, then let cool completely.

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Make the Chocolate Mousse

Traditional chocolate mousse can be super intimidating to make with the tempering of the eggs and all of that, but this version is a quick three ingredient hack that makes mousse that rivals the traditional version without the stress! All thanks to Eagle Brand Sweetened Condensed Milk!

In a large bowl or in the bowl of a stand mixer with the whisk attachment, whip the heavy cream until stiff peaks form. Fit a piping bag with a small round attachment and fill with 1/2 C of the whipped cream. Set aside (you will use this whipped cream to make the ghosts) Cover the remaining whipped cream in the large bowl and set aside.

In a medium sized microwavable bowl, melt the chocolate chips in 30 second increments stirring in between until completely melted and smooth. Stir in the sweetened condensed milk. The mixture will become very thick, don’t panic! Grab the large bowl of whipped cream, and add 1 C to the sweetened condensed milk mixture. Gently fold it together using a rubber spatula. It will seem hard to get incorporated at first because the SCM mixture is so thick, but just keep folding it will come together. Once incorporated, take the entire sweetened condensed milk mixture and add it to the remaining large bowl of whipped cream. Fold together gently until well combined.

Spread the chocolate mousse over the cooled brownie bottom into an even layer. Cover and place in the fridge for at least an hour, up to overnight.

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Pipe the Whipped Cream Ghosts

When the mousse is set, pipe on the whipped cream ghosts. First, run a hot sharp knife around the edges of the pan and lift the mousse cake onto a serving tray. Then, pipe on the ghosts. Apply pressure at the top, then release some pressure while you pull down and then up and away to create the little ghost shapes. Finish with some black sprinkles. Slice with a hot knife, wiping it off between cuts for clean edges, and serve.

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If you loved this recipe for Spooky Brownie Bottom Mousse Cake, be sure to check out some of my other recipes like these Oreo Brownies, or these Pumpkin Streusel Muffins!