1. Preheat oven to 350 degrees Fahrenheit.
2. Beat egg whites until fluffy. Gradually add sugars, beating until stiff.
3. Reduce speed and add yolks, one at a time.
4. Sift flour, cocoa, and baking powder and fold gently into batter.
5. Pour onto two lined cookie sheets and bake for 20–30 minutes. Cool.