Line an 8” x 8”/20cm x 20cm baking pan with parchment.
In a medium pot, combine brown sugar, butter, and honey. Heat over medium, stirring occasionally (very gently), until the brown sugar is dissolved.
Bring the mixture to a low boil. Once boiling, cook for 90 seconds without stirring.
Remove from the stove and mix in the oats, pumpkin seeds, sunflower seeds, cranberries, ground flax, and salt. Keep mixing until everything completely coated.
Scrape into prepared pan and use another layer of parchment to press firmly into an even layer, minimizing as much air space as possible so that all the oats and seeds cling together.
Place the pan in the fridge (uncovered to let moisture escape) to set for at least 2 hours.
Once set, cut into 12 bars with a serrated knife.
Video
Notes
Don't gently pat the mixture into the pan; really press it down so that there’s no air in the mixture.If you’re using coconut oil in place of butter, make sure to only let the mixture boil for 75 seconds, not ninety.Make the granola bars gluten-friendly by using certified gluten-free oats.