Add oats, seeds, cacao powder and nibs, and banana to a bowl. Pour over butter fruit mixture and combine, ensuring all oats are covered.

Pour into a lined 20x20cm tin and press down gently with the back of a spoon.

Bake in oven at 150C for 35-40 minutes until golden. Cool completely then cut with a sharp knife into bites sized pieces. Store in an airtight container for several days.