Sift the flour, baking powder, salt, sugar and cocoa powder. Separately combine the milk, vanilla extract and egg yolks. Mix the 2 together.
Stir the white chocolate drops and mini marshmallows into the mixture.
Whisk the egg whites to stiff peak and fold into the mixture.
Pre heat the griddle side your grill. Spoon some of the mixture onto the griddle in even amounts and allow to cook for 1-3 minutes until the mixture starts to bubble. Flip over and cook for a further 1-3 minutes. Repeat until all mixture is cooked.