Chocolate and yogurt cake

1 2/3 cup of flour
1 1/2 cup of sugar
2/3 cup of cocoa
1 1/2 tspoon of baking soda
2 cups of greek yogurt
1/2 cup of butter
2 eggs
1 tspoon of vanilla

topping
1/2 cup of sugar
2 tbspoons of cocoa
2 tbsppons of butter
4 tbspoons of milk
1 tbspoon of golden syrup
1/2 cup of cooking sugar
sprinkles

Mix all the ingredients for the cake. Put it in a greased cake tray and bake it (gas mark 5-6).
Mix all the topping ingredients but the cooking sugar. Boil it for 3 minutes, whisking it sometimes. Let it cool down, add the cooking sugar and mix it. Decorate with the sprinkles