Stir together the oats, coconut, blueberries and açaí powder in a large mixing bowl and set aside.
Add the dates to a blender or food processor and process until they form a sticky paste (you can also finely chop them).
Melt together the cashew butter, syrup and coconut oil, then add this mixture, along with the date paste, in the dry ingredients and stir until well combined. You might have to use your hands to get everything really incorporated!
Line a 9x9 baking pan with parchment, then dump the contents of the bowl into the pan. Press down to flatten with your hands, then press again with a flat bottomed glass or jar. Press down firmly to really compact the ingredients.
Place in the freezer for 30 minutes, then remove and slice into squares. Store in the fridge or on the counter for up to 5 days.