I used half quantities of Celia's recipe, (also here for ingredients, and method for making individual cookies) and baked in a 20cm(8") square tin. I made a couple of minor changes - I used 180g plain chocolate, roughly chopped, and added the finely grated zest of an orange. A classic flavour combination that's hard to beat!
Cookie Bars don't have the aesthetic appeal of individually baked cookies, but, boy, are they quicker to make! These were particularly tender, with a 'melt-in-the mouth' texture, so I'm sure I'll be using the recipe again.
200g plain flour
1/4 teaspoon bicarbonate of soda
large pinch of salt
finely grated zest of 1 orange
110g light muscovado sugar
50g caster sugar
125g softened butter
1 large egg
1 teaspoon vanilla extract
180g 70% chocolate, roughly chopped
Preheat the oven to 150C fan setting, and line a 20cm (8") square baking tin with parchment.
Whisk flour, bicarbonate of soda, salt and orange zest together in a medium bowl.
In a large bowl cream the sugars and butter together, then add the vanilla extract, egg and a tablespoon of flour (to prevent curdling) and mix until just combined.
With the mixer on a low speed, add the rest of the flour mix, and beat until just combined. Stir in the chocolate pieces by hand.
Transfer the dough to the baking tin and spread evenly, using damp fingers, or the back of a large metal spoon.
Bake for 25 minutes, until firm and just beginning to colour. Cool in the tin, then cut into bars.