Rinse, drain and pat dry the chickpeas.
On a foil lined baking tray, scatter the chickpeas with the oil, paprika, cayenne pepper and oregano.Season with salt and pepper and shake the tray to evenly coat everything. Pop in the oven for 20 minutes.
Add the grated cucumber (squeezed of excess moisture), greek yogurt, lime juice and chopped mint to a bowl. Season generously with salt.
Mix together to make the tzatziki.
Heat a griddle pan or non stick pan and dry toast the flat bread for around 1 minute. Use your tongs to gently fold the flatbread lengthways to form the shape of the gyros. To assemble the gyros start by adding a thick layer of tzatziki, a couple of lettuce leaves, the remaining sliced cucumber, a handful of smoky chickpeas, tomatoes, onion and some crumbled feta. Enjoy!