In a frying pan, add the oil then fry the onion for 7-8 minutes until soft and caramelised.
Add the mushrooms to the pan and fry for 2-3 minutes until soft and browning slightly.
Turn off the heat and season well with salt, pepper fennel seeds and chilli flakes (if using).
Set aside to cool.
In a food processor, add all the remaining flatbread ingredients and blend into a smooth batter.
Then add in the mushroom mixture; blitz briefly until the mixture is just combined.
Pre heat a frying/ griddle pan on a medium heat with a little oil.
Once hot, scoop up 1/2 cup of the flatbread mixture, add to the middle of the pan and, using a spoon, spread the wet mix out on the pan into a circle.
Allow to cook for 2-3 minutes until you can see it’s drying out and the sides come away easily.
Flip the flatbread over and cook on the other side for another 2-3 minutes.
Keep them warm in a bowl with a clean towel over and repeat with the rest of the mixture.