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Scoop the avocado flesh into a food processor. Add the chopped banana, prunes, almond or coconut milk, smooth peanut butter and cacao powder. Blend until smooth, adding a little more milk if the blade gets stuck. Scrape down the sides once or twice and blend again.
Divide the mixture between 4 small glasses. Mix the coconut yogurt with the maple syrup or honey and top each pudding with a generous dollop. Finely grate a little dark chocolate over the top and chill for at least 1 hr.