Combine flour, cinnamon, nutmeg, baking soda, and salt.
Get a helper and make her do the dirty work.
Cream together the butter and brown sugar until very light and fluffy, about 2 minutes. Add the egg and vanilla.
Add the pumpkin puree. Add the reserved flour mixture slowly, and stop when the batter is just combined.
Spray a 9×9 baking dish with cooking spray. Add half of the batter and bake in a preheated 350 degree oven for 10 minutes.
Pour over the caramel sauce.
Cover the caramel with the remaining batter.
Return the blondies to the oven and bake for another 30 minutes. A toothpick should come out clean. Let the blondies cool before cutting.
Pour some more caramel sauce over the top.