Easy Moist Chocolate Cake How to make a rich and moist Chocolate Cake. Here's what you'll need: CHOCOLATE FROSTING: 2 and 1/2 cup milk chocolate (400g) I used milk chocolate in this recipe, so when it's cooled the color will be lighter as shown in the video. 1/2 cup salted butter (110g) 1 cup heavy cream (250ml) -You can chill it for 15-20 minutes in the fridge to set. Or when it's cooled down, you can whip it a bit with spatula. CAKE: 2 eggs 1/2 cup oil (125ml) 1 cup buttermilk (250ml) or you c