Spoon cookie batter onto a parchment-lined cookie sheet (1 large or 4 small cookies) and use your spoon to shape them into circles.
Bake for 5 minutes, and check to see if they are firm. If not, check every minute. Be sure not to over-bake these cookies! Take them out as soon as they are firm.
Let cool.
Put the unflavored and chocolate whey proteins in separate bowls.
2 tablespoons unflavored whey protein powder, 2 tablespoons natural chocolate whey protein
Add 1½ packets stevia to the unflavored, and ½ packet to the chocolate.
2 packets stevia
Add 2 teaspoons filtered water to each. Mix well.
4 teaspoons water
If either icing is not a spreadable consistency, add more water by the ¼ teaspoon.
Turn the cookies over, as you'll want to ice the bottom (flat side) of each cookie.
Ice half of each cookie with the white icing, and the other half with the chocolate.
Enjoy! Store in the refrigerator.
Notes
The cookies will stay well in an airtight container in the refrigerator for several days. A note about substitutions: because each type of protein powder has a distinct flavor and texture when baked, I would not try substituting different types of protein powders in this recipe. The amount of water you'll need for the icing depends on the whey you're working with. Some powders need more liquid than others.I used unflavored whey in the icing so it would be closest to white, but vanilla will taste great, too! In that case you won't need as much sweetener.Also, the icing will stiffen up with time. Try not to make it too much before the cookies are cool and ready to be iced.