• Preheat oven to 350 F. Line a baking tray with parchment paper or use a silicone baking mat.
• Combine ingredients, make sure to use fresh baking powder.
• Spread each cookie out on the baking tray using a full teaspoon of batter for each.
  
• Bake in oven 8-10 minutes.
  
• Let cool before eating for a crispier cookie. I used Optimum Nutrition Vanilla Whey in my cookies but other protein powders will also work. If you use an unflavored protein powder, add a teaspoon of vanilla extract and sweeten it to taste.

Variation of this recipe using egg whites and whole egg:

Replace apple sauce with egg white

• The batter is sticky and hard to spread on the cookie tray. Made drier, rubber texture cookies.
• Nutritional breakdown: 137 calories, 28-gram protein, 1-gram fat, 3-gram carbs.

Apple sauce (20 gram) and egg white

• This created a bread consistency, it was moist and reminded me of a sponge cake. Makes a bigger serving of batter that yields about 15 cookies.
• Nutritional breakdown: 147 calories, 28-gram protein, 1-gram fat, 5-gram carbs. Picture 4.
  

Replace applesauce with a whole large egg

• The batter is sticky. However, the thinner cookies were completely crunchy. Thicker ones were crunchier than other recipes. Probably my favorite flavor and texture wise. Created 16 cookies.
• Nutritional breakdown: 192 calories, 30-gram protein, 6-gram fat, 3-gram carbs. Picture 3.
  

Apple sauce (10 gram) and whole large egg

• These were the moistest cookies and with a mild sweet flavor. Makes a lot more cookies than the other recipes, about 19 of them.
• Nutritional breakdown: 197 calories, 28-gram protein, 6-gram fat, 5-gram carbs.

  Picture 2.