To make my low FODMAP, gluten free lemon drizzle squares first combine the butter and sugar in an electric mixer. Mix on a high speed until pale and fluffy. Next, while mixing on a medium speed add the eggs one at a time and continue mixing until the eggs are incorporated.
Add the lemon juice and zest then add the flour, baking powder and salt. Mix on a medium speed until all ingredients are combined.
Pour your cake batter into a brownie tray, mine measures 30cm by 20cm by 3cm. Also, I line mine with baking parchment to make it easier to turn the cake out.
Bake in the oven for 30minutes, it will be golden brown on top.
While cooling on a wire rack cut into squares. Mix together your lemon juice and icing sugar by hand. Then drizzle over your squares once they cool.