Place the protein powder, cinnamon and rolled oats into a food processor and blitz together until the oats turn into powder.
Add the melted coconut oil, almond butter, honey and vanilla extract into the food processor and blitz again until it forms a sticky dough. If it feels too dry, add 1 tablespoon of water and blitz again.
Line a 20x30cm baking tin with parchment paper and scoop the protein bar mixture into the tray, pressing it down with a spoon. Sprinkle with sea salt flakes and place in the freezer for 30 minutes.
Cut the mixture into 16 protein bars and store in an airtight container, in the fridge for up to 7 days.