You can change this recipe to fit your diet. If you want coffee mousse without dairy, you can use soy milk, oat milk, or some other type of plant-based milk like coconut milk, dairy-free cream, and no-dairy chocolate. For no gluten, just make sure you use gluten-free protein powder. There are also vegan versions of milk, chocolate, and heavy cream you can use, or you can try using silken tofu.