Donna Hay's Standby Brownies make the perfect afternoon treat,
Preheat oven to 160°C (325°F).
Place the butter, sugar and cocoa in a saucepan over low heat and stir until the butter has melted.
Spoon into a bowl and add the vanilla and eggs, whisking well. Sift the flour over the mixture and whisk to combine.
Spoon the mixture into a 20cm-square cake tin lined with non-stick baking paper. Bake for 30–35 minutes or until centre is just set.
Cool in tin and cut into squares to serve.