Baking a pie with the perfect flaky and tender crust is no easy feat. Ideally your dough should be assembled with cold ingredients and a gentle hand. The temperature in your kitchen is always a factor when you bake. If your kitchen is too hot and humid, dry ingredients tend to absorb the moisture in the air. On the other hand, when your kitchen is too cold, bringing ingredients to room temperature can take a while.
Pie dough is no exception to these factors. Baking powder is the secret ingredient to a flaky pie dough. It lightens and expands your crust providing a flaky-like texture. It’ll also make the crust softer in a light and airy way. If your kitchen is too warm or too cold, the baking powder can save the pie. So the next time you run into a tricky weather situation or over handle the dough, reach for about ¼ to ½ teaspoon baking powder to every 1 ¼ cup of flour.
Source: the Kitchn