Preheat oven to 425º.
Place muffin liners in two 12-tin regular muffin tins.
Spray each liner with cooking spray.
Set aside.
In a large mixing bowl, combine flour, brown sugar, granulated sugar, oatmeal, pumpkin pie spice, baking soda, baking powder and sea salt.
Stir until well combined.
In a medium mixing bowl, combine pumpkin puree, oil, applesauce, eggs and vanilla extract.
Whisk until very well incorporated.
Add pumpkin mixture and raisins to the dry mixture.
Stir only until ingredients are moistened.
Divide pumpkin batter between the 24 muffin tins, filling almost to the top.
Sprinkle Streusel Topping over top of muffins.
Press streusel into the tops of the muffin batter so the mixture will adhere.
Bake at 425º for 5 minutes.
Reduce heat to 350º and bake an additional 15-20 minutes, until a toothpick inserted in center comes out clean.
Cool in pans about 10 minutes before removing muffins to wire cooling racks.