01 -
Heat butter in a saucepan over low heat until it sizzles and bubbles. Continue heating until the moisture evaporates and sizzling stops. Cook for 1-2 minutes more until the milk solids turn brown, then remove from heat immediately to prevent burning.
02 -
Transfer the brown butter to a heatproof mixing bowl and allow to cool. Whisk in sugar and brown sugar until combined. Add egg and vanilla extract, mixing thoroughly.
03 -
Sift flour and baking soda into the mixing bowl and stir gently. Fold in 60g of chocolate chips until just combined.
04 -
Slice each croissant in half. Flatten 2 tablespoons of cookie dough and place inside each croissant. Add more chocolate chips before closing the croissant. Top each croissant with another 2 tablespoons of cookie dough and additional chocolate chips for visual appeal.
05 -
Preheat oven to 175°C (350°F). Place the assembled crookies on a baking sheet and bake for 12 minutes until golden brown. Cool for 2-5 minutes before transferring to wire racks. Sprinkle with sea salt if desired.