In a chopper, Add chicken pieces, garlic powder, green chilies, oregano, salt and pepper. Pulse it 3-4 times or until everything mixed well and it resemble mince. Some might be a little coarse meat mince, thats absolutely fine.
Take it out in a clean bowl and add melted butter, lemon zest and lemon juice. Mix well. Check and adjust seasonings if needed. Mix flour and salt in a bowl or plate. Lightly beat the egg whites in another bowl
Take the bread crumbs on another plate
Take a small lemon sized chicken mixture and slightly press it with your fingers to form a nugget. Do not worry about the shape.
Coat the nugget well with flour. Coat it well by dipping it in a beaten egg white and then bread crumbs. Again coat it with egg white and then bread crumbs for second time.. Repeat the same for all the mixture.
Spread it on a plate or tray lined with butter paper or cookie sheet such that they do not stick to each other and freeze them for 3-4 hours.
If you intend to store them for later use, then at this stage, once the nuggets are frozen, gather them all and place it in a Zip lock bag and freeze.
It can easily be stored up to 4 months. You can do it in batches, as the remaining nuggets can rest in refrigerator for a day until last batches are frozen well.
Heat an oil in a deep heavy bottom pan or Kadhai. Once the oil is hot, fry nuggets on medium high flame. until golden brown and crisp, no need to thaw the nuggets on room temperature.
They are fried straight out from freezer. Do not fry them on very high heat as it will burn the nuggets and remain uncooked within. Do not over load the pan, fry them in batches.
Take them out on an absorbent paper towel and proceed with the same for the rest. Serve them hot and crisp with ketchup or dips of your choice.