Using an immersion blender or a zip top bag and rolling pin, crush graham crackers until a fine powder forms.
Combine crushed graham crackers, melted butter, light brown sugar, and fine sea salt in a medium sized bowl.
Line two muffin tins with paper cups and place a tablespoon of the crust mixture into each cup. Press down with the bottom of a glass cup or a measuring cup.
Bake for 8 to 10-minutes, until crust is set and lightly toasted, but not completely browned.
Remove and let cool.
Pie Filling:
Preheat oven to 350°F if not already preheated from making the graham cracker crust.
Combine sweetened condensed milk, key lime juice, sour cream, lime zest and fine sea salt in a medium mixing bowl.
Spoon batter into prepared muffin tins ¼ cup at a time. You should end up with approximately 16 pies. Discard any extra crusts.
Bake for 5 to 7 minutes until set.
Remove and let cool until room temperature.
Cover and refrigerate until completely set, minimum of 2-hours.
Homemade Whipped Cream:
Add whipping cream, and powdered sugar to the bowl of a stand mixer.
Whisk on medium speed until medium-stiff peaks form, about 2 to 3-minutes.
This can be made ahead of time, but is best when used fresh. Just cover and refrigerate until ready to serve.
Serving:
Spoon whipped cream or use a piping bag to top each pie with whipped cream.
Sprinkle with lime zest, granulated sugar, and top with a slice of key lime if desired.
Notes
These quantities in this recipe can be used to make one 9-inch pie if desired. Follow all of the steps but use a 9-inch pie tin or a 9-inch springform pan in lieu of the muffin tins.Pies can be stored covered in the refrigerator for 4 to 5 days.