In a small saucepan, add the cranberries and a splash of water. Heat over medium heat until the cranberries start to burst, and you are able to smash them with a spatula into a jam-like consistency - about 5 minutes. Turn off the heat.
In a small bowl, add the lemon juice and sprinkle the gelatin over the top. The gelatin needs to bloom and set for about 5 minutes. Note - The gelatin will stabilize the whipped cream even more and is a great option if you want to make the pie ahead of time. Otherwise, the gelatin is completely optional.
Add the set gelatin (if using) to the warm cranberry compote and stir until it is completely mixed in.
Strain the cranberry jam through a fine mesh strainer set over a small bowl. Note - Because of the amount of cranberry, I use a small hand held strainer. Be sure to scrape the underside of the strainer to get all of the cranberry jam - which should be about 2 tablespoons. Allow the cranberry jam to cool in the refrigerator for a few minutes before adding it to the whipped cream. In a small mixing bowl, add the heavy cream. Using a hand held mixer fitted with the whisk attachments, beat the cream on medium high until soft peaks form. Add the powdered sugar, vanilla, and cranberry jam. Continue to beat on high speed until stiff peaks form. Refrigerate until ready to use.
Blind Bake (Pre Bake) The Pie Crust - Remove the cooled dough from the refrigerator and let it come to room temperature for at least 15 minutes. Preheat the oven to 425F degrees and adjust the oven rack to the middle position.
Lightly flour your work surface and dust the top of the dough with flour. Roll the dough into a 9-inch circle. This will give us enough dough to sit snuggly into the pan and for a designed crimp edge. Tip - To roll the dough evenly, roll and slightly rotate the dough after each roll.
Trim off any jagged edges, then gently place the dough into the center of the pie dish, making sure it sits snug on the bottom and corners of the dish. Fold over the dough overhang so you still have about a 1/2 inch tall lip of pie dough sticking out of the pie dish. Crimp the edges in any method you prefer. King Arthur Flour has a great video for ideas! Use a fork to poke holes into the bottom of the pie dough. This will help the dough from puffing up while it is baking. Place the formed pie crust in the freezer for at least 10 minutes. By this time, your oven should be heated.
Weigh down your chilled pie crust before blind baking it to keep the dough from puffing up and shrinking too much. Some pie weight options: pie weights, a small oven safe dish that fits inside the pie dish (like a ramekin), uncooked rice, or dry beans. With any method, place a piece of parchment paper big enough to fit inside the pie crust, then add your weight. Pre-bake the pie crust for 12 to 15 minutes, or until the edges start to turn lightly golden. While the crust is pre-baking, make the Pumpkin Pie Filling.