Combine flaked almonds, chopped almonds, pecans, cashews, pumpkin seeds, sunflower seeds, maple syrup and olive oil in a bowl; mix well. Spread out on a baking tray.
Bake in the preheated oven until granola looks loose and dry, about 1 hour 20 minutes. Stir every 20 minutes. Let cool completely before transferring to an airtight container.