Brown the butter

• Melt the butter in a saucepan over medium heat.
• Cook until the milk solids turn golden brown and it smells nutty, then set aside to cool slightly.

Make the cookie dough

• Whisk the browned butter with the sugar and brown sugar.
• Beat in the egg and vanilla extract.
• Fold in the flour, baking soda and salt, then stir in the chocolate chips.

Chill the dough

• Chill the dough so the cookies spread less in the oven.

Bake the cookies

• Scoop the dough onto a baking tray, leaving space between each cookie.
• Bake at 175 °C until the edges are golden.

Assemble the ice cream sandwiches

• Let the cookies cool completely.
• Sandwich a scoop of vanilla ice cream between two cookies and press gently.