For the yogurt sauce, put everything mentioned under the ingredient list for the herb yogurt sauce in a blender and whisk until its smooth. Taste for salt and add any, if required. Keep it aside in a bowl to be used later.

For the patties, crack the egg in a big bowl and put everything else mentioned under the ingredients list for chicken patties in the same bowl. Mix everything to combine it together. Then, layer a big plate or tray with parchment paper. Now take ¼ cup size of the chicken mixture, form a rough patty and place it on the parchment paper. Repeat for rest of the mixture. Once you are done with the patties, place the tray in the refrigerator for about 30 minutes.

After 30 minutes, start by grilling the onion slices and avocado wedges. Place the grill pan on medium high heat and brush some oil. Layer the avocado wedges and onion rings. Press the slices and the wedges with a spatula and cook for a couple of minutes on each side. Once done, take it off the pan and put it in a plate.

Next, grill the chicken patties. Brush some oil to the same grill pan and place the patties without overcrowding the pan. Press the patties very lightly with a spatula and cook for 3 minutes on one side. Flip the patties and place two tiny pieces of the cheese slices. Cover the pan and cook for 2 minutes. Take off the patties and keep them on a plate.

Finally, assemble the burgers by spreading some herb yogurt sauce on one side of the bun, followed by chicken patty, lettuce, grilled onion, grilled avocado and if you wish, some more of the herb yogurt sauce.

Wash it down with some chilled beer or your choice of cold drinks.