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Preheat the oven to 425°F (220°C). Line a large baking sheet with a silicone liner or parchment paper.
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In a small bowl, combine the Massel seasoning powder with the garlic and onion powders, paprika, and cayenne pepper.
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In a large bowl, toss the potatoes, with the olive oil, and then toss through the powdered mixture until the potatoes are evenly coated.
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Transfer the potatoes to the prepared sheet, and roast for 20 minutes, then toss thoroughly to ensure the potatoes cook evenly. Roast for a further 15 to 20 minutes, until the potatoes are cooked through and slightly crispy.
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Stir through the chopped herbs, and season to taste.