Place heavy whipping cream in a stand mixer with the whisk attachment. This can also be done with a hand blender with whisk attachment but will take much longer. Blend for 4 minutes on low speed and adjust speed going up to 6 as it thickens. Once it resembles whipped topping then it's ready.
Fold in the can of sweetened condensed milk. Fold in key lime juice. Pour into the pie crust.
Top the ice cream pie with sliced limes. Wash the lid of the pie crust and flip and place on the pie. Press down the metal edging. Freeze pie overnight.
Once frozen overnight cut with a warm knife and serve.
Calories: 486kcal | Carbohydrates: 47g | Protein: 7g | Fat: 31g | Saturated Fat: 18g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 10g | Cholesterol: 85mg | Sodium: 184mg | Potassium: 313mg | Fiber: 1g | Sugar: 35g | Vitamin A: 1027IU | Vitamin C: 11mg | Calcium: 200mg | Iron: 1mg