Line a large 8 x 8-inch baking pan with parchment paper and set aside.
In a large mixing bowl, add your dry ingredients and mix well.
In a microwave safe bowl or stove top, combine your nut butter with sticky sweetener and melt until combined. Pour wet mixture into the dry mixture and mix until thick and crumbly.
Add pumpkin puree, starting with half a cup first. If still too crumbly, add up to an extra half-cup. Batter should be thick. Transfer to lined baking pan and refrigerate.
Once cool, top with optional chocolate frosting before cutting into bars.
Protein powder is optional- Feel free to omit.* For a stronger pumpkin flavor, feel free to add more than half a cup. To compensate for the moisture, add extra coconut flour as needed.Healthy 4-Ingredient No Bake Pumpkin Pie Bars can keep at room temperature but are best refrigerated. They are also freezer friendly and perfect to portion up in single-serving bars.