Preheat oven to 350 degrees ℉.
In a medium bowl combine, oat flour, baking soda, salt and spices
In a separate bowl, cream together coconut oil, brown sugar, egg and vanilla and mix well. Slowly add the oat flour mixture into the sugar mixture and beat to combine.
Mix-in walnuts if using and place dough in the fridge for 30 minutes to chill.
Once chilled, drop about 1 tablespoon of dough onto a prepared cooking sheet.
Bake for about 12 minutes. While cookies are baking mix together yogurt, maple syrup and cinnamon to create your icing.
Remove from oven and allow to cool. Once cool, top with "icing" and enjoy!