Soaking the Raisins 4 weeks to 24 hours ahead of making the recipe, place the raisins in a glass bowl, and pour enough rum to cover all the raisins. Stir the raisins, and cover the bowl. Keep it in a cool and dry place. Stir the raisins daily till you need to use them. Drain any excess liquor before using. If making without alcohol, bring a cup of water to boil. Dunk the raisins in the hot water, cover and let it sit for 30 minutes. Then drain to use.
Pre heat the oven to 190 degrees and grease the muffin moulds.
Sieve the flour, baking powder, baking soda, and cinnamon powder in a bowl.
In another bowl, beat together the butter and brown sugar.
Alternating, add flour mix and milk to the wet ingredients and fold everything together.
Add the drained raisins and fold them in.
Transfer the batter in prepared moulds and bake at 190 degrees in a preheated oven for 18-20 minutes or until a toothpick inserted into the center comes out clean.