Mix the sour cream and milk together in a large bowl, measure out the oats and allow to soak at room temperature, for 30 minutes.
Whisk the sugar with the oil and butter on a high level until pale and creamy.
Add the eggs to the sugar mixture and whisk well again.
Gently add the soaked oats to the sugar mixture, and fold in until all combined.
Sift the flour, and cinnamon into the wet mix and fold in well.
Add the raisins and stir until evenly distributed.
Spoon into cupcake cases, and fill to 2/3 full.
Place in the oven at 175'C for 20-30 minutes until raised and golden.
Sprinkle a few oats on top for decoration.