Crispy Chicken Croissant Sandwich

Name: Crispy Chicken Croissant Sandwich
Cuisine: American, Mediterranean, French, European
Ingredients: 2 boneless (skinless chicken breasts (about 1 ½ lbs)); Kosher salt and black pepper (for seasoning); ½ cup all-purpose flour; 1 teaspoon garlic powder; 3 large eggs; 1 cup panko bread crumbs; ¼ cup freshly grated Parmesan cheese; ½ cup plain Greek yogurt; 2 tablespoons lemon juice; 1 teaspoon Dijon mustard; 1 teaspoon honey; 1 clove garlic (minced); Kosher salt and pepper to taste; 4 croissants; 2 tablespoons melted butter; ¾ cup Parmesan cheese (divided); 4 cups chopped Romaine lettuce; 2 avocados (sliced); Hot honey (optional, for drizzling)