Combine the flour, icing sugar, cream of tartar, bicarbonate of soda, and cinnamon into a mixing bowl
Add the butter and egg and combine to form a soft dough
If the dough is too dry add the splash of milk
Divide the dough into 5 portions
Roll each portion into a sausage about 18-20 cm on a piece of greaseproof paper
Press down on the top of the dough to flatten the top and sprinkle with caster sugar and nuts
Cook each roll in the microwave separately for 3 minutes
Remove from the microwave, cut into slices then leave to cool
Store in an airtight container between layers of greaseproof paper

I had a request for some microwave sweet treats and what a lovely, simple recipe this Cinnamon Shortbread is, it certainly gets the thumbs up from my family!