Preheat the oven to 160°C fan / 180°C conventional and line a mini cupcake baking tin with 24 mini cases (or bake in two batches of 12).
Cream the baking spread, caster sugar and vanilla together until light and fluffy.
Beat in the eggs one at a time until combined (it helps to add a tablespoon of the flour to stop the mixture from curdling).
Add the rest of the flour, baking powder, cinnamon and milk and fold to combine.
Divide the mixture evenly between the cases, filling each one just over halfway. Bake for 12-15 minutes until risen and a toothpick inserted into the middle comes out clean. Leave to cool on a wire rack.