Preheat your oven to 200C.
Mix together the cumin, paprika, chilli, salt, garlic, olive oil and lime juice in a large bowl.
Add the corn on the cobs and stir to coat thoroughly. (Or, even better, use your hands!)
Place the corn on the cobs on a large non-stick baking tray, ensuring they are well spread out and in a single layer.
Roast in the oven for 20 minutes.