Mix together gluten-flour, baking soda, salt and spices until well blended. Set aside.
With an electric mixer, beat the softened butter with both sugars, molasses and vanilla. Add egg and beat until blended.
Add the flour mixture and stir until blended, then stir in the oats, raisins and nuts.
Using a cookie scoop or a heaping tablespoon, scoop dough and shape into mounds. Put them on a plate, then cover and chill until ready to bake or bake right away.
Preheat oven to 350 degrees F. Line one baking sheet with parchment paper.
Arrange chilled dough portions 2 inches apart on the baking sheet and bake at 350 for 12 to 14 minutes. Let cool completely on the baking sheet.
Let sit on cookie sheet for a few minutes, then transfer to wire racks to Cool
Notes
You can try with any gluten-free flour blend, but I've been buying the Bob's brand 1-1 so that's what I tested with. For the oats, I used Quaker old fashioned. If you are baking for someone with celiac or want to be 100% sure no oats came in contact with wheat, you can use oats labeled gluten-free.