Preheat oven to 350°F. Line an 8×8 baking dish with parchment paper.
In a medium bowl, whisk together almond flour, protein powder, instant coffee, pumpkin pie spice, baking powder, baking soda, salt, and vanilla bean powder.
In another bowl, stir together pumpkin puree, applesauce, non-dairy milk, and Pumpkin Spice Stevia Syrup.
Add the wet mixture into the dry mixture and stir until fully combined into a thick batter.
Spread evenly into your prepared baking dish.
Top with walnuts if desired.
Bake for 25–28 minutes, or until the center is set and a knife comes out clean.
Allow to cool fully before slicing into 9 squares.