1. Preheat oven to 350 degrees F, and spray Woopie Pie Pan with cooking spray
2. In a large bowl, mix together the oats, brown sugar, cinnamon, baking powder and salt.
3. Add in the eggs, melted butter, milk and vanilla extract, mixing well.
4. Stir in raisins.
5. Spoon mixture into each well, filling about 2/3 full.
6. Bake in preheated oven for 25 to 30 minutes, or until golden brown.
7. Remove from oven, letting pies cool completely before removing from pan.