Line a 9x13 inch baking dish with baking paper.
In a medium bowl, combine:
Measure out 250g peanut butter into a saucepan. Remove and set aside 1 heaping tablespoon of this. Then add:
Turn on low heat, stirring often until melted and smooth. Once the mixture starts to bubble, let it cook 1m and remove from the heat.
Working quickly, add the seed/nut mix to the peanut butter mixture and stir until combined. Press into the prepared the pan using wet hands.
Melt 300g chocolate chips with 1 heaping tbsp peanut butter in a large jug in the microwave, stirring every 30 seconds until melted and smooth. Pour the chocolate over the bars and spread in an even layer. Cover and refrigerate for 1-2 hours or until firm.
Cut into 18-24 bars. Store for up to 1 week in the fridge or 4 days on the counter in a cool place.
Modified from Half Baked Harvest