2 1/2 cups flour
1/2 cup confectioners' sugar, plus extra for dusting
1/2 cup chilled, unsalted butter, cut into 1/2-inch cubes
3 ounces chilled cream cheese, cut into 1/2-inch cubes
1/4 teaspoon almond extract
4 eggs
2 cups sugar
1/2 cup fresh Key lime juice (8 to 10 limes)
1 teaspoon vanilla extract
Grated zest of 4 Key limes
Recipe
Preheat oven to 350 degrees.
In a food processor, combine 2 1/4 cups flour, 1/2 cup confectioners' sugar, butter, cream cheese and almond extract.
Pulse until mixture is crumbly but holds together when squeezed between fingers. Working quickly, transfer dough to a 9-by-13-by-2-inch baking dish and press evenly into the bottom and 1/2-inch up the sides.
Bake until lightly browned, 20 to 25 minutes. Transfer to a wire rack and let cool 10 minutes.
In a large bowl, whisk together the eggs, sugar, lime juice, vanilla, lime zest and the remaining flour.
Pour over the warm baked crust. Return to oven and bake until the center is set and no longer sticky, 22 to 24 minutes. The filling will be slightly soft when touched, similar to a custard or pie filling. Transfer to a wire rack and let cool completely. Cover and refrigerate for at least 6 hours or as long as overnight.
Just before serving, cut into bars and dust the top with remaining confectioners' sugar. Store any leftovers in refrigerator, dusting with additional confectioners' sugar before serving.