Place oats, wheat germ, coconut flakes, almond flakes, sultanas, pepitas, spices, salt and zest in a large bowl. Toss to combine thoroughly. Store this muesli mix in an airtight container in a cool part of your pantry for up to 2 weeks.
To make the overnight soaked Bircher Muesli combine 2 cups of the muesli mix, mango, yoghurt, coconut water, apple juice and honey in a large bowl. Mix well to combine evenly. Cover and soak in the fridge overnight. Enjoy chilled with fresh seasonal fruit and extra yoghurt.