Reduced-Fat Lemon Squares | America's Test Kitchen

Ingredients

• 3/4 cup (3 3/4 ounces/106 grams) all-purpose flour
• 1/3 cup (1 1/3 ounces/38 grams) confectioners' sugar
• 3 tablespoons cornstarch
• 1 1/2 teaspoons grated lemon zest
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 4 tablespoons unsalted butter , cut into 1/2-inch pieces and chilled
• 1 tablespoon whole milk
• 3/4 cup (5 1/4 ounces/149 grams) granulated sugar
• 1 large egg plus 1 large egg white, lightly beaten
• 2 tablespoons all-purpose flour
• 1/8 teaspoon salt
• 1 tablespoon grated lemon zest plus 6 tablespoons juice (2 lemons)
• 1 tablespoon confectioners' sugar