Preheat
the oven to 190·C, 380·F, Gas 5. Put the egg yolks, cinnamon
and half the sugar into a large bowl. Using an electric whisk, beat the mixture
until pale and creamy. Add the mascarpone and whisk for a further minute until
smooth.
Remove
the beaters from the whisk and wash and dry them.
Put the
egg whites into a large, clean bowl and whisk until stiff.
Add the
remaining caster sugar and beat for a further 2 minutes until stiff and shiny.
Using
a large metal spoon, fold 1 spoonful of the egg whites into the egg and mascarpone
mixture then gently fold in the remaining egg whites.
Heat the
butter in a 30cm diameter non-stick ovenproof frying pan until foaming.
Add the
egg mixture and cook over a medium heat for 1 minute.
Dot the
blueberries over the top, transfer to the preheated oven and bake for about
25 minutes until golden and just set. Serve with ice cream and maple syrup.