Add the sesame, pumpkin, sunflower seeds and ground flaxseed to a medium sized bowl and stir.
Add the salt, dried herbs, onion powder, garlic powder and nutritional yeast and stir again.
Add the olive oil and warm water and stir until thoroughly combined. Cover and leave for 5-10 minutes (the mixture will thicken and gel up)
Preheat the oven to 170C (340F) and line a large baking tray with parchment paper.
Add your seed mixture and pat down with the back of a spoon so it's evenly and thinly spread out with no holes (it may be easier to place a piece of parchment paper over the top and roll with a rolling pin, then gently peel it off)
Brush with a little olive oil and then place in the oven to bake for 50-55 minutes, or until golden brown and crispy. Do not let them burn!
Remove from the oven and let them cool completely before breaking into pieces. Store in an airtight container for upto 3 weeks. Enjoy!