First of all, prepare the coarse powder of biscuit. You can ziplock them and then with the rolling pin crush them. Or pulse for few seconds 2 or 3 times and get coarse powder of the biscuits.
Take a microwavable bowl and add butter and chocolate. Microwave it for 30 seconds. Keep stirring it until all chocolate melted and mixed with butter.
To this add cocoa powder and vanilla essence. Mix nicely till it is silky and smooth.
Finally, add rest of the ingredients to this melted chocolate. Stir nicely so that all nuts coated properly.
Lay parchment paper on the baking tray (I used 8×8). Pour this mixture into the tray, set it evenly and place it in the fridge for 15-20 minutes.
After 15-20 minutes take this tray out of the fridge and cut int the desired shape. You can dust with castor sugar as well. It is completely optional.
Enjoy these chocolate biscuit bars with milk or in a snack. My daughter loved eating it.