Crush the graham crackers either in a blender or large zip close bag. Add melted butter and brown sugar and mix well.
3 Tablespoons brown sugar, 11 graham crackers , 7 Tablespoons salted butter
Press into a 9 inch pie pan, and use a cup or bowl to press the crust down and help even out the bottom and make it firm. If making ahead, now is the time to bake it at 350 ℉ for 10 minutes. See Note 1. Combine the sugar and orange zest and stirring it together really well to help release the oils from the zest into the sugar.
½ cup white granulated sugar , 1 Tablespoon orange zest
Add in the orange juice, eggs, and cornstarch and blend in a blender for 20-30 seconds until smooth and there are no noticeable egg pieces left. An immersion blender makes this super easy! 1½ cups orange juice , ¼ cup cornstarch, 2 large eggs
Heat over low/medium heat for about 10 minutes, stirring often until the mixture thickens. It will be pretty thick, this is what we want. We don't want it to boil hard and curdle the eggs, just to barely get to the bubbling point.
Remove from heat. Stir in the butter, sour cream, and vanilla. See Note 2. Cover with plastic wrap and let cool to at LEAST room temperature, preferably chilled before adding whipped cream, it should not be warm at all. See Note 3. ½ cup sour cream, 1 teaspoon vanilla, 1 Tablespoon salted butter
Meanwhile, make the whipped cream. In a mixing bowl, combine the heavy cream with the powdered sugar and vanilla and mix with an electric mixer for 3-5 minutes on high speed until it forms stiff peaks.Refrigerate until orange mixture cools. 1¾ cups heavy whipping cream, ⅓ cup powdered sugar , ½ teaspoon vanilla
Spoon half of the whipped cream into cooled orange pudding mixture and stir in thoroughly, then add the other half of the whipped cream and stir in until smooth and creamy. See Note 4.
Spoon mixture into pie shell and smooth the top. Chill for 2-3 hours to set for more firm slices. (You can always serve right away if you don't mind looser slices.)
Serve with orange zest, slices, mandarin oranges, whipped cream, or mint leaves as a fun but beautiful garnish. Enjoy!