There are a few ways to tell if a pumpkin pie is done. First, gently insert a knife into the center of the pie. If it comes out clean, it's done. Another options is to give the pie a little shake. The center of the pie should have a touch of jiggle, but the entire pie should not wobble. The saying is it should jiggle, but not wiggle. Visually the filling will start to darken and puff up a bit.