Mix yogurt, Splenda, egg whites, vanilla in a bowl until well combined. One revision that works is replacing the Yogurt with simply water. (Decrease amount to 6 Tablespoons, cookie and mixture will be a bit more foamy in texture)

In another larger bowl mix protein powder, baking powder, baking soda, cinnamon, nutmeg and salt. Gradually mix in liquids.

The protein powder will make it a bit hard to mix well. After mixed, put in refrig covered for 30 min to make it easier to handle (optional)

Preheat oven to 375

Shape dough into walnut sized balls and placed on a untreated baking sheet. Press cookie ball with bottom of a glass to flatten, they should become about a 1.5 inch parameter and 1/4 inch thick.. Little thin is okay. they do not spread much when baking

Bake for 10-12 minutes or until light brown. If you used yogurt, they will be chewy, if you used water, they will be a bit more tender and foamy. Longer they sit out, the harder they become. After a day or two, they harden to the point of something resembling a ginger snap. I'm going to attempt higher baking temp/time in the future maybe speed this process up.

Should make about 14 cookies.. They are a total of little under 400 calories for all of them.. Mostly protein. (Water modification will make this 300 with near zero carbs)