This is my final recipe from Cake Days. This recipe calls for raisins but I am leaving those out.
(image from asensibleheart)
190g/7oz softened unsalted butter
190g/7oz caster sugar
3 eggs, at room temperature
190g/7oz plain flour
1 tsp baking powder
25ml/1fl oz soured cream
1 tsp vanilla extract
1 tbsp ground cinnamon
Preheat oven, 170c/160c fan/gas 3. Grease/line a 2lb loaf tin.
Cream butter and sugar until pale, beat in the eggs one at a time. Sift and fold in the flour, baking powder and salt. Fold in the soured cream and vanilla. Into a smaller bowl spoon in about 200g/7oz of the mixture, then you fold the cinnamon into this.
Using a tablespoon pour in the vanilla mixture first then the cinnamon and then you swirl it with a skewer.
Bake in the oven for 50-60 minutes, until a skewer inserted in the middle comes out clean. Once baked, take out of the oven and leave to cool in the tin for 15 minutes on a cooling rack, then remove from the tin and place on the rack again.