Instructions

1. Brown the butter: Place your butter in a pan and heat on a stove, stirring regularly. The butter will first melt and as the water content evaporates the melted butter will brown, first slowly, then very quickly. Once this happens, immediately take off the heat and add an ice cube to replace some of the lost water and stir it in. Browning the butter changes the flavour profile int something a bit more nutty.
2. Sift together the flour, bicarb and salt; set aside.
3. In a medium bowl, beat together the browned butter, brown sugar and caster sugar until well blended. Beat in the vanilla, egg and egg yolk until light and creamy. Mix in the sifted ingredients until just blended. Stir in the chocolate chips by hand using a wooden spoon.
4. Using an ice cream scoop or a spoon, make a bunch of cookie dough balls and place into a container or a baking tray.
5. Rest the dough for at least 48 hours, up to seven days in the fridge. This allows the flavours to develop.
6. When ready to bake preheat the oven to 190°C (170°C fan, Gas mark 5). Grease baking trays or line with parchment, and place cookie balls onto the baking tray. Allow 8cm between each ball as they will spread in the oven. No need to flatten the balls.
7. Bake for 15 to 17 minutes in the preheated oven, or until the edges are lightly toasted. Cool fully on baking trays before removing. For cookie dough, bake for 10 minutes and serve immediately.

Tips

• The extra egg yolk and soft brown sugar is what gives the cooky the chewy texture. So don't change that bit of the recipe. If you want a chewier texture, replace more of the caster sugar with soft brown sugar.
• You can replace the chocolate chip cookies with nuts. If doing this, add a bit more butter than you would otherwise to keep the cookie moist.
• For cookie dough, this recipe comes out on the sweet side, so reducing the sugar content and adding a bit more flour would even the flavours out.
• For an extra twist, sprinkle some sea salt flakes to the cookie as soon just before you put it in the oven.