Ingredients
Method
- Preheat oven to 175°C (155°C fan / Gas 3½). Grease and line a 23cm square tin.
- Melt butter and chocolate together until smooth. Cool slightly.
- Whisk eggs, sugar and vanilla for 3–4 minutes until thick and pale.
- Fold in the melted chocolate mixture.
- Sift in flour, cocoa powder, baking powder and salt. Fold until just combined.
- Fold in chocolate chips and walnuts.
- Pour into the tin and bake for 30–35 minutes until a skewer has a few moist crumbs.
- Cool completely in the tin before slicing.
Notes
Baking powder is what gives these a thicker structure compared to a fudgy brownie — don't skip it.
Load generously with chocolate chips and walnuts for the true American style.
Start testing with a skewer from 28 minutes, as these bake slightly faster than expected.
Toasting the walnuts first deepens their flavour noticeably.
Freeze cut squares for up to 3 months.
