In a medium bowl, whisk together all dry ingredients (except sugar substitute) until well combined, set aside.
In a separate bowl - the bowl of a stand mixer fixed with a paddle attachment, or a large bowl, if using a hand mixer - cream butter and sugar substitute until smooth and fluffy. Be sure to scrape down the sides of the bowl a few times, to make sure everything is incorporated into the mix.
Add the eggs and extracts to the mix, beating well to combine.
With mixer turned down to low speed, slowly add dry ingredients mix to the mixing bowl of wet ingredients, and carefully mix until well incorporated and smooth.
Wrap dough ball in plastic film, chill for 1 hour. This is an important step for any gluten free cookie dough, don’t skip it!
Lightly dust work surface with a little more protein powder, roll dough out to 1 about ¼″ thick (can be slightly thicker). Use cookie cutters to cut out whatever shapes you’d like, place cookies 2″ apart on prepared cookie sheets.
Mix together remaining sugar substitute and spice, sprinkle over top of the cookies. Cover and chill for 30 minutes.
Preheat oven to 350 F,
Bake cookies for 8-10 minutes, or until golden brown on the bottom.
Once completely cool store in an airtight container until serving.
Notes
Just over 6 grams of carbs per cookie come from sugar alcohols, leaving you with just under 2 grams of net carbs per cookie!