In a large bowl, whisk together sweetened condensed milk, key lime juice, whole egg, yolks, and vanilla.
Pour into pie crust.
Return to oven, and bake at 350 degrees for 12-15 minutes, or until set.
Remove to a wire rack to cool completely.
Chill thoroughly, at least 2 hours.
Garnish with whipped topping (I used a star tip to pipe it onto the pie), macadamia nuts, and toasted coconut.
Cut and serve. Store leftovers in refrigerator.