Preheat your oven to 190°c (170°c for fan-assisted or Gas Mark 4) and line your muffin tin with 10 cupcake cases.
In a large bowl, cream together the butter and sugar until light & fluffy.
In a separate bowl, sift the flour and spices together.
Add one egg to the butter & sugar mixture, ensuring it is well combined. Add a third of the flour & spices to the wet ingredients, alternating with the rest of the eggs and flour to the mixture; this will prevent the ingredients from separating.
Finally add the treacle & milk and mix until just combined.