Substances:
- 100 g (3.5 oz) of butter
- 90 g (1/2 cup) of sugar
- 2 clear eggs
- zest and juice of 1 clear lemon
- 210 g (1½ cups) of easy (all motive) flour
- 3 tsp of baking powder
- 1 tsp of baking soda
- ⅔ cup of thick Greek yoghurt
- 250 g of blueberries (thawed if frozen)