Slice the chicken breasts horizontally to make 4 equal-sized pieces. Season with salt, pepper, garlic powder, and paprika.
Dredge the chicken in flour, dip in beaten eggs, and coat with panko crumbs.
Cook the chicken in a large skillet until golden brown and cooked through. Set aside.
Whisk together Greek yogurt, lemon juice, Dijon mustard, honey, garlic, salt, and pepper to make the dressing.
Toast the croissants, top with Parmesan cheese, and broil until golden.
Toss lettuce with the lemon dressing and Parmesan cheese. Assemble the sandwiches with chicken, avocado, and lettuce.
Drizzle with hot honey (optional) and serve.