Preheat oven to 350°F (175°C). Lightly grease a 12-cup muffin tin.
Roll out the pie crust and cut 3–4 inch circles (a biscuit cutter or glass works great). Press each circle into the muffin tin to form mini pie shells.
In a mixing bowl, whisk together pumpkin puree, egg, sweetened condensed milk, pumpkin pie spice, vanilla, and salt until smooth.
Spoon the pumpkin mixture evenly into each prepared crust, filling about 3/4 full.
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Fit the dough rounds into your mini muffin pan: Grease a mini muffin pan. Press the dough flat into the bottom of the crevice and up the sides.
Bake for 20–25 minutes, or until the filling is set and a toothpick inserted comes out clean.
Allow the mini pies to cool completely in the pan before gently removing.
Top with whipped cream and a sprinkle of cinnamon before serving.