Place the melted peanut butter in a bowl and whisk in the honey and coconut oil until smooth, add in the granola and mix until combined.
Press into parchment paper lined square tin and then freeze for about 20 minutes until set.
Whilst the granola bars are setting, heat up the peanut butter for the top layer until smooth, add 1-2 tbsp coconut oil if needed. Whisk in the vanilla extract and the soy milk powder.
Add this top layer to the set granola layer, smooth out, and cool again for about 30-40 minutes before slicing into bars.