Lemon Icebox Bars

INGREDIENTS

• 1/4 cup pasteurized egg product (such as egg beaters)
• 1/2 cup fresh lemon juice
• 1 teaspoon finely grated lemon zest
• 2 tablespoons melted unsalted butter
• 14 whole-grain graham cracker squares (7 full sheets)
• 3 tablespoons boiling water
• 1/4 teaspoon salt
• Cooking spray
• 1 tablespoon dark brown sugar
• 1 (8-ounce) package 1/3 less-fat cream cheese, softened at room temperature
• 1 (14-ounce) can fat-free sweetened condensed milk
• 2 teaspoons powdered gelatin