Preheat oven to 200C/Gas Mark 6

Chop sweet potatoes into 1/2 inch sized cubes. Peeling the skin from the sweet potatoes is optional. I prefer to leave them on, just giving them a really good wash and scrub beforehand.

Chop onions into chunks and slice the garlic cloves.

Place sweet potatoes, onions and garlic in a large bowl.

Drizzle 2 to 3 tbsp of olive oil over them and shake/toss the ingredients ensuring they are all covered.

Sprinkle seasoning over ingredients and shake/toss again, coating as much of the sweet potato as you can.

Transfer to a baking tray. Make sure the sweet potato is spread out and not over lapping, plenty of space is needed to ensure they roast all over. Use 2 baking trays if needed.

Cook for 30 minutes, turning over at 10 minute intervals.

The sweet potato should be crispy on the outside and soft on the inside when ready.