Separate egg whites from the eggs. Set aside yolks for another recipe. Add in salt or cream of tartar to the deep bowl with the egg whites.
Beat egg whites in mixer on high speed for about 4 minutes until they start to change from clear to white.
While still beating on high speed, slowly add in sugar (1 tbsp at a time) while mixing for another 4-6 minutes until firm, frothy peaks form.
Add cocoa powder with sifter, mix by hand just enough to swirl powder around.
Transfer the mixture to a large piping bag or plastic freezer bag. If using the freezer bag, snip a small hole in one bottom corner. If using piping bag, use a tip of your choice.
Pipe mixture onto parchment lined baking sheet making small, bite-sized cookies. Or you can also make larger ones if you’d like.
Bake in oven for 3.5-4 hours on low temperature (200°F) until completely dehydrated.
Let cool completely.
Store in sealed plastic or glass jar for up to 3 months.