4 Ingredients Coffee Mousse Dessert Recipe | Easy & Delicious Coffee Mousse. This is a rich and light foamy food with coffee flavor that could be served with any other desserts. To make this coffee mousse, you only need coffee, sugar, milk and whipping cream. The cookies and grated chocolate I have used in this coffee recipe is optional. You can use any cookies that you like most, and it is not mandatory. You can serve it just after making, but for denser texture of coffee mousse, it is better to keep it in refrigerator and chilled before serving.