Preheat oven to 350 degrees.
Line 2 baking sheets with parchment paper or silpat liner.
In a stand mixer add the butter and sweeteners and mix.
Add the egg and pumpkin purée and beat.
Scrape sides of bowl and beat again.
Add the baking powder, soda, spices and gluten free flour.
Beat on low speed until batter is smooth.
Stir in walnuts.
Use an ice cream scoop to drop batter onto lined pan.
Bake in oven for 11-13 minutes.
Remove and cool.Icing- in saucepan add butter and brown sugar and heat until melted.
Remove from heat.
Add vanilla and whisk well.
Add icing sugar and whisk.
Use a spoon to add a dollop of icing onto each cookie.
Sprinkle with a bit of walnuts.
Enjoy!