Secret Ingredient Lemon Bars Recipe | Valerie Bertinelli | Food Network

Ingredients

• Nonstick cooking spray, for the pan
• 2 1/4 cups all-purpose flour
• 3/4 cup freshly grated Parmigiano-Reggiano
• 1/3 cup confectioners' sugar, plus more for garnish
• 1 cup (2 sticks) unsalted butter, melted and slightly cooled
• 2 cups granulated sugar
• 1/3 cup all-purpose flour
• 2 tablespoons lemon zest plus 1 cup freshly squeezed lemon juice (from 4 to 5 lemons)
• 1 teaspoon vanilla extract
• 6 large eggs