Preheat your oven to 350 degrees. Lightly spray a loaf pan with non-stick cooking spray and if you prefer, line the pan with parchment paper. Set aside.

In a medium bowl, whisk together the flour, pumpkin spice, salt, baking soda, and baking powder.

In a large bowl, use a hand held mixer to combine the sugar, brown sugar, milk, and egg whites until well blended. Next, add in the pumpkin puree and incorporate into the mixture.

Add the dry ingredients to the wet ingredients and fold together using a spatula.

Pour the batter into the loaf pan and tap the pan firmly on the countertop to settle the batter into the pan and to eliminate bubbles.

Bake for 55 minutes. Check for doneness with a toothpick.

Allow the loaf to cool for 5 minutes in the loaf pan before removing to a wire cooling rack to completely cool.

Dust with confectioner's sugar for presentation if you desire.