Preheat the oven to 375°F (190°C) and line a 10x15-inch (25x38 cm) jellyroll pan with parchment paper. Set aside.

In a large bowl with a wooden spoon, mix together the butter, granulated sugar, brown sugar, vanilla extract and salt until blended.

Fold in the flour until just combined, then stir in chocolate chips.

Press evenly into your prepared pan, then bake for 15-20 minutes or until golden brown and crisp.

Let cool for 5-10 minutes, then use a sharp knife or pizza cutter to cut into pieces while still warm.

Let cool completely, then store in an airtight container at room temperature for up to 1 week.