In the bowl of a stand mixer, add butter and erythritol. Cream with the paddle attachment until light and fluffy.
Add in almond flour (and vanilla if using) and mix in slowly until completely incorporated and a soft dough forms.
Add in chocolate chips and stir briefly until they are evenly mixed into the batter.
Remove dough and place between two sheets of parchment paper. Roll out the dough until it is 3/8 inch thick. Place rolled out dough into the fridge and let it firm up for 30 minutes. The dough does not need to be completely chilled, just firm enough that you will be able to remove the cookies from the parchment paper.
While waiting for the dough to firm up, preheat oven to 350°F. Line two baking sheets with parchment paper or silicone baking mats.
After 30 minutes, remove dough from fridge. Slice into 1.5 inch by 2 inch rectangles. Carefully peel cookies from parchment paper and place onto prepared baking sheets, spacing cookies about 1 inch apart.
Bake cookies about 15-17 minutes or until edges turn light brown. Cookies will still be soft in the middle but the dough should not look uncooked.
Let cookies cool completely on sheet pan. Once the cookies are cooled they will firm up.
Notes
Make sure to use superfine almond flour and not almond meal.
The cookies are not overly sweet. If you wish for sweeter cookies, you can add a little more erythritol to the dough.
If you want to leave out the chocolate chips, I definitely recommend adding the vanilla.
Don't roll the dough too thin, otherwise it will be very hard to remove the dough from the parchment paper.
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The estimated nutrition carbohydrates count excludes sugar alcohols. The net carbs excludes both fiber and sugar alcohols.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.