What is the purpose of adding baking powder to a recipe that contains yeast?
Most baking powder available today is double-acting baking powder. The &quot;first&quot; action is when it gets wet. The &quot;second&quot; action is when it gets hot (above 140°F/60°C).
Generally speaking, the yeast would provide the pre-bake rise, and then the baking powder would assist with additional spring once it's in the oven.
Interesting about this recipe that you link to is that the yeast gets a very short amount of time for the yeast to proof before baking. The recipe calls for a 5 minute rest after mixing, but no additional proofing time after shaping. I'm not familiar with these particular cypriot pies at all, but my first impression is actually that because there isn't a step to let the pies rise after they are shaped, the baking powder is likely somewhat necessary to ensure a decent lift.