Meringues with Cocoa Powder

0 Preheat oven at 280F.
1 Place the egg whites in a very clean mixing bowl. Whisk at medium-high speed until the whites begin to froth. 
4 Add the sugar one spoonful at the time while whisking at high speed. Egg white will become glossy and begin to form stiff peaks. 
6 If you want to add powdered chocolate, this is where you need to do it. Be careful not to overbeat it. 
2 Line a baking sheet with parchment paper and spoon the mixture on it at an even distance. 
5 Set in the middle of the oven and bake for 50 minutes. Then turn the oven off and leave the meringues in the oven, without opening the door for another hour.
3 Place the meringues on a plate and dust with cocoa powder before serving.