Preheat oven to 350F.
Add gluten-free graham crackers to a food processor and process until finely ground.
Add granulated sugar, melted butter and salt and mix until combined.
Pour into a 9-inch pie pan that is 1-inch high. Press to the bottom and sides of the pie pan until even.
Bake at 350F for 10-12 minutes, until the graham cracker crust is golden and fragrant. Remove from the oven and allow to cool for 5-10 minutes.
Place egg yolks and lime zest into a large bowl. With a stand mixer or hand mixer, mix on medium-speed for 2-3 minutes, until light in color.
Add sweetened condensed milk and mix another 2 minutes.
Add key lime juice and vanilla extract and mix until combined.
Pour into pie crust and bake at 350F for 18-22 minutes, until the edges of the pie are set. The middle will still be a little wobbly. It will finish setting as it chills.
Let cool to room temperature for at least 30 minutes.
Lime Sugar Topping:
Rub together the granulated sugar and lime zest until the oils have released from the lime zest into the sugar and has made it fragrant.
Sprinkle the lime sugar over the slightly cooled key lime pie.
Refrigerate the key lime pie for at least 3 hours.
When you're ready to serve the key lime pie, make the whipped cream topping. In the bowl of a stand mixer fitted with the whisk attachment, add heavy whipping cream and granulated sugar. Beat on high until stiff peaks form.
Mix in the vanilla extract.
Pipe with a pastry bag fitted with the 1M (open star) tip or dollop on the key lime pie before serving.
- If you do not have key limes, you can use regular limes instead. You can also use bottled key lime juice in this recipe. I recommend Nellie and Joe's Key Lime Juice.
- I used Kinnikinnick Gluten-Free S'moreables Graham Crackers for the crust. If you are not gluten-free, you can use regular graham crackers in this recipe.
- You can use store-bought whipped cream instead of homemade if you would like.
Calories: 529kcal | Carbohydrates: 60g | Protein: 7g | Fat: 30g | Saturated Fat: 17g | Trans Fat: 1g | Cholesterol: 187mg | Sodium: 264mg | Potassium: 238mg | Fiber: 1g | Sugar: 44g | Vitamin A: 883IU | Vitamin C: 6mg | Calcium: 193mg | Iron: 1mg