Pre heat a fan forced oven to 170°
Place high lipped oven tray full of water at the bottom of the oven.
Add egg, sugar and grapeseed oil to a large mixing bowl and beat with beaters for 1 minute.
Add yogurt and 1 third of the blueberry glaze and beat for another minute until well incorporated.
Add flour and salt to the mixture and beat for another minute.
Gently stir through the rest of the blueberries and then pour cake mixture into a cake tin that has been greased and dusted with flour.
Smooth out the cake batter with a spatula then pour the rest of the blueberry glaze on top.
Bake in the oven for 60 minutes or until a skewer can be inserted into the middle of the cake and come out clean.
Allow the cake to cool in the pan.
When cool remove the cake from the pan and slice in half horizontally.
Spread blueberry jam on the bottom half of the cake and then replace the top.
Dust with icing sugar and serve.