Grease and line your baking tin/s with baking paper, leaving enough so that it overhangs the baking tray. Heat the oven at 160°c fan/180c/350f/gas 4.
Make sure your apples are chopped into 5cm chunks. Set aside.
Cream the butter, sugar and lemon zest in with your electric mixer for 3 minutes, until pale and creamy. Add the eggs one at a time whilst mixing.
In a separate bowl, mix the flour, salt and baking powder. Pour half of this into your egg mixture and mix until combined. Pour in the greek yoghurt, mix again, and then add the remaining flour.
Spoon the batter into your tins and smooth out evenly. Top with the apples. No need to push in!
Bake for 40 minutes or until the sponge is cooked. Leave to cook completely.
For the icing, mix the icing sugar with enough water to make a thick glaze. Drizzle over the cooled cake, then slice and serve.
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Notes
I used one baking tray for a taller sponge, but you can easily spread them out over two small baking trays, but you make need more apples to cover them both.