Preheat the oven to 180°C or 356°F
Using a stand or hand mixer add the butter, eggs and sugar to the bowl. Whisk until mixture is creamy.
Add the yoghurt, poppy seeds and cinnamon and lemon zest to the bowl. Whisk the ingredients until you achieve a smooth batter.
In a separate bowl, sieve the flour and baking powder together.
Pour the wet ingredients into the dry ingredients, then whisk to completely combine.
Pour or spread the batter into a greased cake tin.
Bake the cake for about 50 minutes. Oven times may vary. To check if the cake is done, poke a toothpick into the middle of the cake. If it comes out clean your cake is done. Remove the cake from the oven and let it cool before adding the icing.