This easy Chocolate Mousse Cake Recipe is the kind of dessert that feels impressive without feeling intimidating. It’s made with simple steps, familiar tools, and results in a chocolate lover’s dream.
Chocolate Cake
0 Start by preheating your oven and preparing a 9-inch round cake pan. Line the bottom of the pan with parchment paper, then lightly oil the sides and dust them with cocoa powder. This extra step ensures the cake releases easily and keeps the edges clean and chocolate-colored.
2 In a medium bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt. This step ensures the cocoa powder and leavening are evenly distributed. Set aside.
3 In a large bowl, beat the sugar and oil on medium speed until well combined, about 1 minute. Add the eggs, one at a time, mixing after each addition.
4 Add the vanilla extract and sour cream, mixing until smooth.
5 Add the dry ingredients in stages, alternating with the hot coffee. Mix gently and stop as soon as the batter is smooth.
6 Pour the batter into the prepared pan and bake for 25-30 minutes in the middle rack of your oven, or until a toothpick inserted in the middle comes out clean.
7 Let the cake cool in the pan for 15 minutes, then transfer to a cooling rack to cool completely before adding the mousse.
Chocolate Mousse
9 Place the chopped chocolate or chocolate chips in a heat-safe bowl and melt gently in the microwave in 20–30 second intervals, stirring between each, or over a double boiler. Stir until completely smooth.Set aside and let cool until just barely warm to the touch, not hot.
10 In a large bowl, add the cold heavy cream, powdered sugar, vanilla extract, and salt. Beat on medium speed until soft peaks form.The cream should look thick but still soft and slightly droopy. Do not overwhip!
11 Scoop about ½ cup of the whipped cream and whisk it into the melted chocolate until smooth and glossy. This step helps prevent the mousse from curdling.
12 Pour the chocolate mixture back into the bowl with the remaining whipped cream. Using a spatula, gently fold until just combined and smooth. Stop as soon as no streaks remain.
Assembly
14 Place the cooled cake on a serving plate. Spoon the chocolate mousse filling over the top, starting in the center and working your way outward.
15 Using the back of a spoon, gently spread the mousse into an even layer, creating soft, natural swirls as you go.
16 Since this recipe makes a generous amount of mousse, use an offset spatula to smooth the mousse around the sides, making the mousse even with the edges of the cake.
17 Refrigerate the entire cake until the mousse is set, about 2-3 hours. Slice carefully, wiping the knife clean between cuts for neat layers.
