Place chicken in a small bag with about a cup of water and a tbsp of salt to brine (this can be done while chicken is thawing if frozen, brine for about 1 to 2 hours)
Heat a medium skillet or frying pan to medium high heat and pour about a tablespoon of olive oil into pan
Remove thawed chicken from brine and pound to an even thickness and add a small amount of salt to both sides of the breast
Place chicken in pan and fry until golden brown on one side and the flip and cover pan, turn heat to just above low and cook for 10 minutes
While the chicken is cooking chop the onion, lettuce and tomato and toast the bun until golden brown.
Once the chicken breast is finished cooking move to a plate and pour hot sauce over the chicken breast
Assemble the sandwich; Apply mayo to the bun then top with the prepared toppings and add chicken ( for large chicken breast you can cut in two and use to make 2 sandwiches if preferred!) And enjoy!