Beat 1/2 cup of butter in your mixer. Add eggs, one at a time. Scrape edges to make sure it is well mixed.
Add 2/3 cup of brown sugar alternative, vanilla and pumpkin to the mixing bowl. Mix together well.
In a small bowl add the almond flour, salt, pumpkin pie spice, baking powder and soda. Mix together.
Add to your mix half at a time. Mix and add the other half.
Pour into a greased 9x13 pan (or a smaller one for thicker bars). Bake at 350 degrees for about 20 minutes. Check the bars. They need to be soft but not runny. If you used a smaller pan, you will need to bake them longer. The bars will flatten some as they cool down.
For the frosting, beat together the butter and cream cheese.
Add the sweetener, heavy cream, and vanilla. Beat again.
Scrape edges if needed.
Once the bars are cooled, frost.
Slice into bars and enjoy. Keep stored in fridge.