Line a 9 x 9 inch (22cm x 22cm) square baking pan with parchment paper. Set aside.
In a food processor or high-speed blender, add the packet of biscuits and pulse to a medium crumb, leaving some bigger chunks. Set biscuits aside.
Place a medium-large flat-based saucepan over low heat, and add butter and sugar. Gently melt butter down whilst stirring occasionally with a wooden spoon, until it’s completely melted and sugar has begun to dissolve, it won’t dissolve completely. Turn off the heat once all of the butter has melted. Allow it to cool down for 15-20 minutes.
This cooling step ensures your eggs won’t cook when you add them next. To test if it’s cooled enough, dip in your finger and it should feel slightly warm/at room temperature, it should not be hot. Refer to notes.
Once cooled, stir through beaten eggs until well combined.
Add cocoa powder and stir until well combined. Return to stovetop and place over low heat. Continue stirring through the cocoa until it’s well blended and break up any pockets of cocoa.
Stir through vanilla.
Continue to heat through and stir over low heat until the mixture is warm and some small bubbles begin to appear in the middle. This process will take about 3 minutes.
Turn off heat add desiccated coconut, mix until well combined. Then add the crushed biscuits and gently mix through until well combined.
Pour the mixture into the lined pan and smooth out the top. Be careful handling the pan and mixture as it will still be hot.
Transfer the hedgehog to the refrigerator and allow it to sit for 3-4 hours or overnight until it’s firm.
Remove slice from pan and cut into squares.
Enjoy!