Put the oats and peanut butter in a large mixing bowl. Mix together until well combined.
Add the three-quarters (60g / 2 oz) of chocolate chips.
Mix through, aiming to distribute the chocolate chips evenly through the mixture.
Line a tray with baking paper. Divide the mixture in 24 balls and place on the tray.
Each ball will weigh about 22g (0.77 oz). If the mixture seems too stiff to roll into balls, simply knead in your hands for a few seconds to warm, then they should then roll easily.
Melt the remaining chocolate chips and either pipe or drizzle over the oat balls in a zigzag pattern.
Place the tray in the fridge for an hour to firm up and then enjoy! They're best transferred to a sealed container in the fridge once firm to keep them at their best.
It's also up to you whether you use sweetened or plain peanut butter. If you're using plain but want to a hint of sweetness, simply add 1 tbsp honey (not vegan) or maple syrup or agave syrup to the mix.