To prepare the cashew milk, blend all ingredients in a powerful blender till they're totally smooth. Set the milk aside. (You'll have about 4 1/2 cups cashew milk, and you can reserve leftover for coffee, smoothies, porridge, etc.)
To prepare the muesli, mix all muesli ingredients together in a mixing bowl. Add 1 3/4 cups cashew milk; alternatively, add 1 3/4 cups of a non dairy milk of choice. Stir to combine. Cover, and let sit overnight in the fridge. In the morning, scoop muesli into two bowls, pour some extra cashew milk (about 1/4 or 1/3 cup) on top, and garnish with extra pear slices if desired. Serve.