Preheat your oven to 190°C (170°C fan). Line a large baking tray with parchment paper.
Slowly melt the butter in a pan until fully melted, then let it cool for a few minutes.
175 g unsalted butter
In a large bowl, beat the cooled melted butter with the brown sugar and granulated sugar until fully combined.
225 g light brown soft sugar, 100 g granulated white sugar
Add the egg, egg yolk, and vanilla extract. Beat until the mixture is lighter in color, smooth, and slightly fluffy.
1 teaspoon vanilla extract, 1 medium egg, 1 egg yolk
Sift together the flour, bicarbonate of soda, and salt. Gradually add these dry ingredients to the wet mixture, beating until smooth and well combined.
275 g plain flour, 1/2 teaspoon bicarbonate of soda, 1/2 teaspoon sea salt
Fold in the chocolate chips using a spatula or wooden spoon.
325 g milk chocolate chips
Using a 5 cm cookie scoop or large spoon, portion the dough evenly onto the prepared trays. Aim for about 6 cookies per tray, leaving space between them.
Bake in the preheated oven for 12–13 minutes for soft, chewy cookies or up to 15 minutes if you prefer a slightly crispier edge with a soft center.
Let the cookies rest on the tray for 5 minutes after baking, then transfer to a wire rack to cool completely.
Continue scooping and baking with the remaining cookie dough until it’s all used up.
Notes
Tips and Tricks
Butter: Use unsalted butter for better control over salt in the recipe.
Sugars: Light brown sugar adds moisture and chewiness, while white sugar helps with crisp edges.
Eggs: Using an extra yolk makes the cookies chewier and richer.
Baking Time: Watch your cookies closely; ovens vary! Remove cookies when edges are golden, centers may look slightly underbaked—this keeps them chewy.
Storage: Store cooled cookies in an airtight container for up to 5 days or freeze for longer storage.