Preheat oven to 300 degrees. In a large bowl, combine oats, pistachios, pumpkin seeds, unsweetened coconut flake, maple syrup, olive oil, brown sugar, salt, cinnamon and cardamom. Mix well to make sure everything is coated in maple syrup and olive oil. Line a rimmed baking sheet with a Silpat or parchment paper. Spread mixture onto the lined baking sheet in an even layer and bake for 45 minutes, stirring every 10 minutes, until golden brown and well toasted.