Barefoot Contessa's Lemon Bars

INGREDIENTS

1/2 lb

unsalted butter at room temperature

1/2 cup

granulated sugar

2 cups

all-purpose flour

1/8 tsp

kosher salt

extra-large eggs at room temperature

3 cups

granulated sugar

2 tbsp

grated lemon zest (4 to 6 lemons)

1 cup

freshly squeezed lemon juice

1 cup

all-purpose flour

Confectioners’ sugar, for dusting