01 -
Using a stand mixer with a paddle attachment, whip up your softened butter, brown sugar, and white sugar on medium for around 3 minutes until everything’s fluffy and light.
02 -
Blend the egg and vanilla into your butter-and-sugar mix. Start on low speed, then bump up to medium-high for a minute to make sure it’s smooth.
03 -
Scrape the sides of your bowl if needed, then mix in cornstarch, baking soda, and salt for about 30 seconds. Add the flour one cup at a time, only mixing until it just combines in.
04 -
Stir in your chocolate pieces on low or fold them in gently using a spatula until the dough is evenly studded with chocolate.
05 -
Set your oven to 175°C (or 350°F). Prep a baking sheet by laying down some parchment paper.
06 -
Grab a serrated knife and carefully cut each croissant open like a book—don’t cut all the way through.
07 -
Grab roughly 1/2 cup of the cookie dough per croissant. Spread a thin layer inside each one and gently close it back up.
08 -
With the leftover bit of dough from your 1/2 cup, flatten it a bit in your hands first, and press it onto the top edges of your croissant. Repeat for all croissants.
09 -
Pop the croissants onto your tray and bake them for 10–12 minutes. You’re aiming for cookie dough that’s just golden, not too dark.
10 -
Once out of the oven, let them cool for a couple of minutes on the tray. Serve warm for the best experience.