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Preheat oven to 350F (175C) and line a 13x9 metal baking pan with parchment paper (or lightly grease and flour the pan).
Combine melted butter and sugar in a large bowl and stir well.
Add eggs, egg yolk, and vanilla extract and stir until completely combined. Set aside.
In a separate bowl, whisk together flour, cornstarch, baking powder, and salt.
Gradually stir the dry ingredients into wet until just combined.
Fold in white chocolate chips and nuts, if using.
Spread blondie batter into prepared pan and transfer to oven.
Bake on 350F (175C) for 25-30 minutes or until a toothpick inserted in the center comes out clean or with a few fudgy crumbs.
Allow to cool before cutting and enjoying.