Preheat the oven to 375° F. Lightly spray a standard 12-cup muffin pan with nonstick cooking spray.
Unroll the pie crusts on a lightly floured surface. Using a 3 1/2-inch round cookie cutter, cut circles from the dough, re-rolling the scraps as needed.
14.1 ounces refrigerated pie crusts
Press one crust circle into each muffin cup, gently shaping the dough along the bottom and up the sides.
In a large mixing bowl, whisk together the pumpkin puree, sweetened condensed milk, eggs, pumpkin pie spice, and vanilla extract until smooth.
15 ounces pumpkin puree, 14 ounces sweetened condensed milk, 2 large eggs, 1 Tablespoon pumpkin pie spice, 1 teaspoon vanilla extract
Divide the pumpkin mixture evenly among the prepared pie crusts, filling each nearly to the top.
Bake for 25 to 30 minutes, or until the crust is lightly golden and the filling is set around the edges with just a slight jiggle in the center.
Let the mini pumpkin pies cool in the pan for about 10 minutes, then carefully remove them and transfer to a wire rack to cool completely.
Refrigerate until ready to serve. Top with whipped cream, if desired.