Preheat oven to 425°F and spray a 24 cup mini muffin pan with nonstick cooking spray. Set aside.
Cut pie crust out into circles using a jar lid. Push pie circles down into the muffin cups. If needed, gently knead and roll out any extra dough left from the rings to make a total of 21 circles.
Mix pumpkin pie filling ingredients in a large mixing bowl until smooth. Divide filling among the mini pie shells.
Place in the pre-heated oven and bake for 10 minutes. Reduce temperature to 350 and bake an additional 10-12 minutes, until pie filling is just set and a toothpick inserted into the center comes out clean.
Remove from oven and cool for 10-15 minutes before removing from muffin tin. Top with whipped cream and garnish with some ground cinnamon, if desired.