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Heat half of the oil in a frying pan and gently cook the onion for approximately 5-10 minutes until soft, then remove from the heat and allow to cool.
Using a food processor, finely chop the spinach along with the cooled onion, breadcrumbs, cheddar and parmesan. Transfer to a bowl and add in the beaten egg, then combine until the mixture holds together. Divide into 4 equal amounts and shape into burgers.
Place the flour into a shallow bowl or dish, season well and dip the burgers into it to coat fully.
Pre-heat your favourite grill to maximum and cook the burgers for 6-10 minutes with the lid closed, until they are golden brown and cooked through.
Serve in a wholemeal bun with your favourite accompaniments. We recommend a chilli mayonnaise, more spinach leaves and some vegetable crisps for a delicious crunchy bite!