Grease and line an 18 cm (7") square baking tin (base measurement) with baking paper/parchment with sides overhanging (see my notes) and set aside.
Place biscuits in a food processor and process until fine crumbs (or place them in a sturdy plastic bag and bash them with something like a rolling pin) and set aside.
250 g plain sweet biscuits
Place chocolate, salted butter and condensed milk into a medium-sized glass bowl, and heat in the microwave (in 30-second bursts, mixing between each) until melted and smooth.
200 g caramel filled chocolate block, broken into squares, 50 g salted butter, 395 g sweetened condensed milk
Once the chocolate has melted, add peanut butter and vanilla, mixing to combine.
⅓ cup peanut butter, ¼ teaspoon vanilla
Then add biscuit crumbs, mixing well.
Place mixture into prepared tin & smooth the top - I use a mini silicone spatula.
Sprinkle coconut evenly over the slice & refrigerate for 1½ hours or until set.
1 tablespoon dessicated coconut
Slice into 16 bars (or 24 bites - see notes) and serve.