Make the marinade by combining all ingredients. Add the chicken thighs and toss to combine. Store in the fridge for 30 minutes to an hour.
While chicken marinades, prepare the pickled onions and jalapeños. Cover the thinly sliced onions and jalapeños with the juice of a lime and a pinch of salt. Toss to combine.
Once the chicken has marinaded, remove each piece and let the excess marinade shake off before adding to a hot pan over medium-high heat. Cook for 5-7 minutes per side or until cooked through.
Preheat the oven to broil. Open each ciabatta roll and place on a baking sheet. Toast the rolls under the broiler for 2 minutes.
After toasting, add a piece of cheese to one side and a cooked chicken thigh to the other and return to the broiler for 1 minute or until cheese is melted.
Remove the seed from the avocado and roughly smash with a fork.
To assemble the sandwiches, top the chicken with a generous serving of smashed avocado, pickled jalapeño and onion, and Chipotle Sour Cream Sauce. Add the top of the roll and enjoy!