When you are ready to roast them, pre heat the oven at 180 C and line a baking tray with oil free parchment paper. In large mixing bowl, add the chips, add sea salt to taste, 3/4 tsp turmeric powder, 1.5 tsp smoked paprika (use red chilli powder as a substitute), 2 tsps sumac, 2 tbsps olive oil, 2 tsps garlic granules or garlic powder, 1 tsp onion powder. Mix them well and ensure the chips are coated well in the spices.