Step 1: Preheat an oven to 325 degrees F.
Step 2: In mixing bowl, mix butter, erythritol, stevia, egg, and vanilla until well blended.
Step 3: In a separate bowl, add all the dry ingredients and mix until well combined.
Step 4: Add the dry mixture to the wet mixture and mix again until well blended.
Step 5: If desired, chocolate chips or nuts can be mixed in at this time.
Step 6: Shape the mixture into a large ball of dough. Place dough ball on a silicon baking pad or a well greased cookie sheet. Shape dough into a low, flat log.
Step 7: Bake the dough for about 20 minutes, or until lightly browned and cake-like.
Step 8: Remove from oven and reduce the temperature to 275 degrees F.
Step 9: Cool the log for about 10 minutes and then slice into thin strips about 1/2 inch wide.
Step 10: Place the slices on their side on the cookie sheet, and then bake for about 20-30 minutes, or until they are fully crisped.
Step 11: Recipe makes about 15 cookies.