Recipe Method

1. Preheat oven to 180°C.
2. Mix oil and sugar together well.
3. Add eggs and vanilla, stirring until just blended.
4. Mix all dry ingredients in a separate bowl and then stir into the oil/sugar mixture.
5. Make the peanut swirl: Stir the butter, icing sugar, peanut butter and salt together in a bowl until smooth.
6. Pour the chocolate batter into a lined and greased 20 x 28 cm pan; spread evenly with a spatula. Drop dollops of peanut butter mixture on top of batter, spacing about 3 cm apart.  Gently swirl peanut butter mixture into batter with a butter knife, running the knife lengthwise and crosswise through layers to create a pattern
7. Bake for 20 minutes or until sides just start to pull away from the pan.
8. Cool completely before cutting.