In a skillet, over low to medium heat, toast the pecans gently. When fragrant, remove from heat and allow to cool. Chop the toasted pecans and set aside.
Prepare an 8x8 inch baking pan with parchment paper and set to the side.
In a large bowl, melt the coconut oil and sprinkle the gelatin over the surface.
Add the pumpkin puree, protein powder, allulose, pumpkin spice, salt, vanilla, and monk fruit. Using an immersion blender, blend the mixture until uniform and smooth.
Pour the batter into the prepared pan. Sprinkle the chopped pecans over the top, evenly. If desired, sprinkle flaky sea salt over the top as well.
Place the fudge into the freezer for 1-2 hours, or into the fridge for 4-6 hours, to set. Cut into 25-36 even squares. Store in the fridge for up to a week or in the freezer for up to a month.