Pumpkin Nutella Loaf

• nonstick cooking spray, for greasing
• 2 cups all purpose flour(250 g), plus 2 tablespoons
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon kosher salt
• 2 teaspoons ground cinnamon
• 1 teaspoon freshly grated nutmeg
• 1 teaspoon ground ginger
• ½ teaspoon ground cloves
• ½ teaspoon ground allspice
• 15 oz pumpkin puree(425 g), (not pumpkin pie filling)
• ½ cup unsalted butter(115 g), melted
• 3 large eggs
• 1 cup granulated sugar(200 g)
• ⅔ cup brown sugar(135 g), packed
• 1 teaspoon vanilla extract
• 1 cup nutella(280 g)

Stabilized Whipped Cream Frosting (Optional)

• 1 ½ tablespoons cold water
• 1 teaspoon powdered gelatin
• 1 ½ cups heavy cream(360 mL), very cold, plus 1 tablespoon
• 2 tablespoons powdered sugar
• 1 teaspoon vanilla extract
• 1 pinch kosher salt
• sprinkles, of choice, for decorating (optional)