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Heat oven to 200C/180C fan/gas 6. Mix the sugar and cinnamon in a bowl. Whisk egg white, then roll the plums first in egg white and then the cinnamon sugar until very well coated in a sugary crust.
Space apart in a buttered baking dish, then bake for 15 mins or until the plums are crusty, cooked through and starting to be juicy. To test, poke in a cocktail stick; if it goes in easily, they are ready.