In a medium saucepan over medium heat, slightly melt the peanut butter with maple syrup.
Add ground cinnamon and sea salt flakes, and mix everything together.
Add the rolled oats, and mix until the oats are well coated.
Press the mixture onto a greased cookie sheet, and bake at 160°C (320°F) for 20 to 15 minutes flipping halfway through.
To know if the granola is done, take a piece out of the oven and let it cool. If it hardens within a few minutes then it's ready, if not then bake for a few minutes longer.