Preheat the oven to 180°c
Place the butter, caster sugar, egg, flour, baking powder, vanilla extract & salt in a large bowl, mix until combined
Mix together the brown sugar & cinnamon, set aside.
Pour 1/3 of the batter into a lined loaf tin.
Spoon 3 tbsp of Blackcurrant jam on top
Pour the remaining batter on top of the jam
Finally spoon the remaining jam on top of the batter
Sprinkle the brown sugar mix on top
Pop in the oven for 40-45 minutes, until golden & a skewer comes out clean
Allow to rest for 5 minutes, place a plate or chopping board on top of the loaf tin. Flip over, so the loaf tin is upside down, gently lift off the tin. Leave to cool .