Prepare skillet with cooking spray and heat on medium until hot. In a mixing bowl, combine egg white, milk, vanilla, and spread. In another mixing bowl, combine baking mix and baking powder. Mix dry ingredients with wet ingredients just until moistened. Ladle in the batter, using 2 or more tablespoons per cake. Cook for 2 minutes, then flip carefully and cook for 2 minutes more. Repeat with remaining batter.