Lemon Bars
For the Crust
1/2 cup unsalted butter (1 stick), very soft
1 cup all-purpose flour
1/4 heaping cup confectioners' sugar
1 tablespoon cornstarch
pinch salt, optional and to taste
For the Filling
2 large eggs
1 cup granulated sugar
1/2 cup lemon juice, or to taste
2 tablespoons half-and-half (whole milk or cream are okay)
1/2 teaspoon vanilla extract, optional and to taste
1/2 teaspoon lemon extract, optional and to taste
2 tablespoons all-purpose flour
2 teaspoons lemon zest loosely packed, or to taste (see note below)
confectioners' sugar, for dusting



