In a bowl, mix the flour, baking powder, oats, and cinnamon, then add the liquids. You don't need a mixer, just a whisk to combine the batter.

Add the raisins and give it a final stir to distribute them evenly, then pour the mixture into a lightly greased baking pan.

Bake in a preheated oven at 400°F for about 40 minutes, depending on your oven. I measured all the ingredients with a large 350ml glass.