Advance Preparations: Both the crust and the frosting can be made a day in advance. Cover and store the crust at room temperature and keep the frosting in the fridge until you're ready to assemble.
Variations: Feel free to add a zesty twist to the frosting with 2–3 teaspoons of fresh lemon or lime juice, along with some zest. You could also include 1/2 teaspoon of almond extract for an extra layer of flavor.