Classic Chocolate Chip Cookie Bars

• 2 and 1/4 cups (281g) all-purpose flour (spooned & leveled) ↔ Replace
• 1 teaspoon baking soda ↔ Replace
• 1 and 1/2 teaspoons cornstarch ↔ Replace
• 1/2 teaspoon salt ↔ Replace
• 3/4 cup (12 Tbsp; 170g) unsalted butter, melted and slightly cooled ↔ Replace
• 1 cup (200g) packed light brown sugar ↔ Replace
• 1/3 cup (67g) granulated sugar ↔ Replace
• 1 large egg plus 1 large egg yolk, at room temperature ↔ Replace
• 2 teaspoons pure vanilla extract ↔ Replace
• 1 cup (180g) semi-sweet chocolate chips ↔ Replace
• optional: sprinkle of flaky sea salt ↔ Replace

Converted measurements are approximate; the original source remains authoritative.

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