Preheat the oven to 200oC / 400oF / Gas Mark 6
Remove the stones from the plums and slice into quarters. Place in a saucepan with the water and a little sweetener if required. Heat gently over a low heat until the plums become soft and the skins start to come away from the fruit.
Whilst the plums are stewing, spray the inside of a oven proof 5 inch frying pan /skillet with 6 - 8 sprays of Frylight / Pam (you can use a bigger pan but you'll get a thinner less puffy pancake). Put the pan in the oven to heat up.
Place the egg, plain flour, milk, salt and sugar into a blender and whizz till thoroughly combined. If you do not have a blender place the dry ingredients in a bowl. In a separate bowl, whisk together the egg and milk. Slowly whisk the wet ingredients into the dry ingredients until you have a smooth, lump free mixture.
Set aside the mixture until the pan has heated up (5 - 10 minutes). Remove the pan from the oven and pour the pancake mixture in, return to the oven and cook for 15 - 18 minutes until the pancake has puffed up and turned a golden brown colour.
Remove the pancake from the oven. The centre of the pancake will deflate once out of the oven but the sides should stayed puffed up. Spoon the stewed plums into the centre of the pancake. Top with a tablespoon or two of fat free natural yogurt and dust with a little icing sugar / powdered sugar.