- Butter an 8″ square pan and pre-heat your oven to 180C.
- In a saucepan set over low heat, melt butter and chocolate. Let it cool.
- Combine sugar and eggs. Add the cooled chocolate mixture.
- Add in the flour, cocoa powder and baking powder. Fold in the walnuts
Transfer the batter to the baking dish. Top with peanut butter and using a skewer, make swirls.
- Bake at 180C for 30 minutes.