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Heat oven to 200C/180C fan/gas 6. Pierce the potatoes a few times each and put on a baking tray. Cook for 50 mins until really soft. Leave to cool slightly.
Scoop the sweet potato flesh out of the skins into a bowl. Mash with the coriander, season and gently fold through the feta. This can be done earlier in the day – cover and keep in the fridge. Heat a large griddle pan.
Spread the sweet potato mixture over half of each tortilla, top with chorizo slices and fold the other side over. Cook on the hot griddle pan for 3 mins each side until golden. Cut each tortilla in half and serve.