Preheat oven to 300°F.
Line a baking tray with parchment paper.
Place seeds in a bowl with olive oil, cinnamon, and brown sugar.
Toss to combine and evenly coat all seeds.
Spread the seeds onto the prepared baking tray into a single layer.
Place in oven and bake for about 45 minutes or until the seeds begin to turn golden brown.
Stir the seeds every 15 minutes while baking to ensure they do not burn.