For The Crust:
- 1 stick unsalted butter, room temperature
- 1/4 cup confectioner’s sugar
- 1 cup all-purpose flour
- pinch of salt salt
For Key Lime Topping:
- 2 large eggs
- 2/3 cup sugar
- 3 tablespoons all-purpose flour
- three tablespoons key lime juice
- 1 teaspoon grated key lime zest
Preheat oven to 350°F. Line an 8 by 8 inch pan with aluminum foil.
In a large bowl, beat together butter and sugar until light and fluffy, about 2 minutes. Add salt and flour and beat until well combined, about one minute. Press dough evenly across bottom of baking pan. Bake until crust is just turning golden brown, about 25 minutes. Let crust cool to room temperature.
In a large bowl, beat together eggs and sugar until well combined, about two minutes. Beat in flour until evenly incorporated, then lime juice and zest. Pour topping over cooled crust.
Bake until the key lime mixture is set, about 25 minutes. The filling will continue to set as it cools. Let bars cool completely before cutting in squares.
From Serious Eats