Preheat oven to 375. Grease a 1-1/2 quart* casserole dish.
Sprinkle the raisins over the bottom of the baking dish.
In a bowl, combine the oats, pumpkin pie spice, salt, and baking powder. Stir until well combined and sprinkle evenly over raisins.
To the same bowl (now empty), add the milk, egg, pumpkin puree, maple syrup, vanilla. Whisk until smooth, then continue whisking as you pour in the melted butter. Pour the pumpkin mixture carefully over the oats.
Sprinkle the pecans over the top. Bake for 30-35 minutes or until golden and set in the center.
Serve immediately with milk. Additional toppings might include: maple syrup or brown sugar.