Preheat oven to 180C fan forced
Grease and line 20cm x 30cm slice tin, extending the baking paper over the wider edge of the tin (this will help with removing baked slice)
Place flour, corn flour, oats, salt, bi carb soda and sugar into TM bowl and mix 6 seconds / speed 4
Add coconut oil and mix 40 seconds / Reverse / speed 5 (do not clean bowl)
Divide oat mixture in half - mix should weigh approximately 1070g, so use 550g on base and the rest on top
Set aside one half for topping, and press the other half firmly into base of slice tin (use back of spoon to get it even)
Bake for 15 minutes until golden
As base is baking, prepare filling: place lemon zest, juice, pitted dates and water into TM bowl and cook 8 minutes / Veroma / speed 1 / MC off / basket on top
Once base is removed from oven, spread date mix evenly over base
Crumble remaining oat mixture over top lightly pressing it into the date mix (I use the back of a spoon to even it out)
Bake for 15 minutes, turn tray around and continue for another 10 minutes until golden brown
Remove slice from oven and allow to cool for an hour, then refrigerate for two hours to get cold before attempting to remove from tin (this will help firm up the slice making it easier to remove)
Carefully remove slice from tin by lifting the extended baking paper on one side so that it lifts out in one piece with the baking paper supporting it
Place slice (still sitting on baking paper) onto board and cut into desired amounts with a sharp knife (I like to cut it into 24 squares) wiping the knife on kitchen paper between cuts to get nice even edges
Best stored in fridge where it will keep for up to a week