Thumb biscuits

Apparently today is National Nutella day. I love any combination of chocolate and hazelnuts, so I decided to make a really easy biscuit that I've made many times for my children and grandchildren. Don't know where the original recipe came from - it's in my handwritten notebook. I've made them with jam and with lemon curd, as well as with Nutella.

It makes about 18 biscuits.

175g butter
175g caster sugar
1 egg
175g plain flour
125g plain flour
Nutella

Line a baking sheet with some parchment paper.
Preheat oven 180C/gas 4

Beat the butter and sugar together using a mixer till nice and fluffy.
Beat in the egg then add the flours, a bit at a time.
Leave the dough for about an hour to rest.
Take out tbspns of the mixture, roll into a ball then flatten on the baking sheet. Press your thumb in the top to make a hole. Fill the hole with Nutella.
Make sure you space the biscuits out on the baking sheet, because they spread.
Bake for about 12 mins.
Cool on a wire rack.

I can think of a few variations I must try - adding cocoa to make chocolate thumbs, or coffee essence, lemon juice etc. It's a good basic biscuit recipe.