Preheat oven to 400°F (200°C) and line two baking sheets with parchment paper.

In a mixing bowl, cream together softened butter, brown sugar, and granulated sugar until light and fluffy.

Mix in vanilla extract, then gradually add flour and salt until a cookie dough consistency forms.

Fold in chocolate chips, ensuring even distribution throughout the mixture.

Roll out one sheet of puff pastry on a lightly floured surface into a 12x10 inch rectangle.

Spread half of the cookie dough mixture evenly over the pastry, leaving a 1-inch border.

Cut the pastry into 1-inch wide strips, then twist each strip 2-3 times.

Place twisted strips on prepared baking sheets, brush with beaten egg, and sprinkle with coarse sugar.

Bake for 15-18 minutes until golden brown and flaky.

Cool on wire racks for 10 minutes before serving.