Preheat your oven to 325°F (170°C) and grease and line a 9 x 9-inch (23 x 23-cm) baking pan with parchment, letting the excess parchment hang over two sides of the pan.
To a large bowl add the oats, nuts, California prunes, coconut flakes, puffed millet, chocolate chips and chia seeds, stirring to combine. Use your hands to break up any larger chunks of prune stuck together and break them up coating them with the other ingredients so they don’t stick back together.
In a blender mix together the maple syrup, olive oil, mashed banana, cinnamon and salt until smooth. If you don’t have a blender you can really mash up the banana and thoroughly whisk the mixture. Pour into the large bowl, stirring to coat the granola mixture.
Pour into the prepared pan, pressing firmly and evenly with the back of a spatula, trying to make it as level and compact as possible. Bake in the center of the oven for 30 to 35 minutes or until golden around the edges. Let cool completely before: 1) running a knife along the edges of the pan (to loosen from the sides), 2) covering the pan and 3) placing in the freezer to thoroughly chill and firm up for at least 3 hours or ideally, overnight.