Preheat oven to 180˚C.
Place chocolate brownie mix, 50ml vegetable oil, 25ml water and 1 egg in a mixing bowl, stir until well combined (with wooden spatula or hand whisk). Fold in almond nibs and pour the batter in a greased rectangle baking tray.
Repeat step 2 for original brownie mix. Spread the original batter over chocolate batter in the tray.
Swirl the top layer to make a marble pattern.
Bake at 180˚C for 25-30 minutes. Set brownies aside to cool completely before cutting into squares.