Mix all ingredients, besides the peanuts and peanut butter, with a beater for 1 minute at a slow speed and then 2 minutes at medium speed. Place Brownie Batter in lined baking tray, distribute evenly. Pipe on peanut butter randomly and swirl with a spatula. Sprinkle peanuts on the top and bake.
Bake at 180°C in a deck oven for 35-40 minutes.
Cut into the required sized squares.