Preheat oven to 350 degrees F and grease a 9x13 inch baking dish with cooking spray. Set aside.
Cobbler Topping
Mix melted butter, brown sugar, vanilla, flour, pumpkin pie spice, baking powder, and salt together in a medium sized bowl until well combined. Set aside.
Cobbler Filling
In a large bowl, whisk together pumpkin purée, sweetened condensed milk, brown sugar, vanilla, pumpkin pie spice, and salt until smooth.
Pour into prepared baking dish, spread out into an even layer, then sprinkle with optional pecans.
Use a small cookie scoop to scoop the cobbler topping over the filling, then use your hands to gently press down and spread out the topping.
Sprinkle turbinado sugar over the top.
Bake in preheated oven for 30-45 minutes or until the filling has thickened and the topping has cooked.
Remove from the oven and cool slightly before scooping and serving with vanilla ice cream/whipped cream/cool whip and a drizzle of caramel.