There are a few things to remember or try to get a puffy pie top when making apple pie. First, be sure to cut slits or vents in the top crust to allow steam to escape. Brush the top crust with an egg wash or milk before baking. This will help the crust to brown and will give it a glossy finish. Bake the pie at a high temperature for the first 15-20 minutes, then reduce the heat to finish baking. This will help the crust to puff up and become flaky. Make sure the filling is not too wet, as this can prevent the crust from puffing up. If the filling is too wet, you may need to add a little more flour or cornstarch to absorb some of the excess liquid.u003cbr /u003e