Brown the butter in a pan for about five minutes on a medium heat, stirring constantly. Let it cool.
Add the browned butter to a bowl with light brown sugar and granulated sugar. Whisk.
Add one egg, one egg yolk, and vanilla extract. Whisk until slightly lighter in colour.
Add double cream and whisk until slightly lighter in colour.
Add plain flour, bicarbonate of soda, baking powder, and salt. Mix.
Fold in milk chocolate chunks and dark chocolate chunks. Optionally add milk chocolate chips.
Weigh the dough and divide into portions (e.g., 100g each).
Bake at 180 degrees Celsius for 10-12 minutes, or until the top is golden.
