Bake Play Smile
Whisk together the flour, rolled oats, salt and bi-carb soda. Stir in the sugars and mix until they're smooth. Add the vanilla to the melted butter, then pour the mixture over the dry ingredients. Stir everything together until it's well-combined.
Pop half of the crumb mixture into the bottom of the prepared tin and press into an even layer. Bake in a preheated oven, then put aside whilst you make the filling.
Whisk together the condensed milk, lemon zest and juice, egg yolks and lemon extract until well blended. Pour the mixture over crumb crust and spread into an even layer.
Sprinkle the remaining crumble mixture over the lemon layer. Bake again until the topping is lightly brown. Remove from the oven and allow to cool before covering and chilling in the fridge for at least 2 hours.
Once the slice is chilled, cut it into bars and enjoy!