Preheat your oven to 275°F / 120°C.
In a large mixing bowl, whisk together the maple syrup, protein powder, vanilla extract (if using), and sea salt until smooth and fully combined.
Add the flaked barley, oat bran, walnuts, chia seeds, and sesame seeds to the bowl.
Stir until all the dry are evenly coated with the maple syrup mixture.
Spread the granola mixture in a single, even layer on a large baking sheet.
Bake for 50 to 60 minutes, stirring at the halfway point to ensure even toasting. The granola is done when it's golden brown and feels dry to the touch.
Remove the baking sheet from the oven.
While it's still warm, stir in the dried strawberries, blueberries, and goji berries.
Let it cool completely before serving or storing.
Serve with your favorite milk, yogurt, or kefir. Store in an airtight container at room temperature for up to two weeks.