Preheat the oven to 180°C/350°F/Gas Mark 4 and line a 20-cm/8-in brownie pan with baking paper.
Combine all the ingredients in a large mixing bowl and mix really well to combine.
Tip the mixture into the prepared pan and spread it evenly. Press down with a large flat spatula or fish slice to compress the mixture a little and make sure you have a nice, smooth top.
Pop the pan in the oven and bake for about 30 minutes, until golden on top. Check it halfway through, and if it looks like it is browning a little too quickly (or that the goji berries are going a bit dark), cover the top with a piece of foil.
Remove from the oven and let it cool in the pan for a few minutes and firm up.
Use the baking paper to lift it out of the pan and onto a chopping board. Let it cool completely. Slice into 12 bars to serve or store.
Store in an airtight jar or container for up to one week.
Naturally Delicious Snacks & Treats by Gracie & Sophie Tyrrell, published by Pavilion Books. Image credit: HaaralaHamilton.
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