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Heat the grill to medium. Heat the oil in a medium non-stick frying pan, then add the onion, squash and sage. Fry over a medium high heat until soft and golden. This should take around 10 mins.
In a bowl, mix together the eggs and the cheese. Season, then pour over the cooked squash and onion mix. Leave for 5 mins on a low heat, moving the mix around a little while it starts to set.
Once the frittata is set, but still a little wobbly on top, flash it under the grill to set. Allow to rest for a few mins, then turn out onto a plate or cut into wedges straight from the pan.
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