Place the butter (cubed), caster sugar and cocoa into your Thermomix bowl and cook for 3 minutes, 65 degrees speed 2. If the butter hasn’t quite melted, cook for a further 1 minute, 65 degrees, speed 2.
Add the vanilla extract, eggs and plain flour and mix for 10 seconds on speed 4 to combine
Scrape down the sides of your bowl and mix for a further 10 seconds on speed 4.
Pour into the prepared tin and gently smooth surface.
Add the peanut butter in dollops before using a butter knife to swirl it through the brownie mixture.
Bake for 30 - 35 minutes or until a skewer inserted into the middle comes out clean.
Notes
It is essential to not overcook the brownies, to ensure you have a soft and fudgey centre.
For best results, allow the brownies to completely cool before slicing into pieces.
Plain flour can be substituted with gluten free plain flour.
Either crunchy of smooth peanut butter can be used.
Cooking times are for a 20cm square baking dish. Other sized dishes may be used, however the baking time will vary.
Store in an airtight container at room temperature. Consume within four days.
These brownies are freezer friendly and can be frozen for up to two months.