Heat oven to 350°F (180°C) and fold a 7x11 inches (15x25 cm) baking pan with parchment paper.
In a large bowl, add egg, maple syrup, almond butter, vanilla extract and salt. Using a whisk or fork, lightly beat the egg.
Add pumpkin puree and homemade pumpkin spice mix to the egg mixture, then stir until smoothly combined.
Add wholewheat flour, almond flour and baking powder to the wet ingredients. Using a spatula or fork, stir well until the dry ingredients are fully incorporated into the wet mixture. The batter should be smooth and free of lumps.
Transfer pumpkin batter to the prepared baking pan, spreading it out evenly.
Bake in hot oven for 30 - 35 minutes, or until a toothpick inserted into the center comes out clean.
Allow pumpkin bars to cool completely before frosting. In the meanwhile, prepare the healthy frosting - add all ingredients to a bowl and mix until combined.
Frost pumpkin bars with cream cheese frosting, then slice into 12 bars.