The Best Vegan Chocolate Mousse 400 ml can coconut cream. 1/2 cup raw cacao powder. 1/4 cup rice malt syrup. 1/4 cup chia seeds. cacao nibs, optional. 1. Place all ingredients in a large mixing bowl. Whisk ingredients together until well combined and smooth. Pour into 4-6 serving glasses. Sprinkle with cacao nibs if you like. 2. Chill in the fridge for at least 3 hours, or until firm.