In a large mixing bowl, add all of the ingredients except for the raisins. Whisk until everything is evenly combined.
Add the raisins and use a wooden spoon to fold them in.
Spray a muffin pan with cooking spray (or line the pan with muffin cups), and spoon the batter into the pan, filling each muffin cup about 3/4 of the way to the top.
Bake for 18-20 minutes, until the tops are golden brown. The muffins are done when they are slightly golden brown on top and you can stick a knife in the center and it come out clean.
Remove from oven and let cool for about 5 minutes before removing them from the pan. After removing them from the pan, let cool on a wire rack before serving.