Preheat the oven to 180oC, gas mark 4. Grease and base line a 20cm roundcake tin.
Sift together the flour, baking powder, sugar and cinnamon. Beat the eggs, oil, vanilla and yogurt together in a large bowl then fold in the flour mixture until just combined.
Stir the Walnuts and grated apple into the cake mixture and spoon into the prepared tin. Bake for 30-35 minutes until golden and a skewer comes out clean. Allow to cool before removing from the tin.
Notes
Cooks tipFor extra texture, add a crumble topping by mixing 25g oats with 1 tbsp honey and 1 tbsp fat free yogurt with 2 tbsp chopped Walnuts and sprinkle over the cake mix before baking. Sprinkle with extra chopped Walnuts to decorate.Salt 0.43g