Preheat oven to 400F
Thinly slice pickles and lay them out on parchment paper, then pat them dry
On a parchment-lined tray, sprinkle a thin layer of cheddar cheese, then lay out 4-5 pickle slices close together to form a rectangle, season if desired, and add another thin layer of cheese
Repeat to create a second 'slice' of pickle and cheese
Bake for 19-20 minutes until golden and crispy
Remove from oven, let cool slightly, and gently peel
Assemble the sandwich by layering mustard, sriracha, lettuce, red onion, tomato, avocado, and chicken between the two pickle-cheese slices
Cut in half and serve
