Heat oven to 375 degrees. Grease an 8-inch cast iron skillet or 1-quart baking dish with butter.
Step 2
In a large bowl, combine the cream cheese, mayonnaise, shallot, chives, garlic, lemon juice, Cajun seasoning, mustard powder, Worcestershire sauce and 1/3 cup Parmesan. Stir until well combined. Add the crabmeat and gently stir until just combined, trying to not break up the large lumps. Season with pepper to taste.
Step 3
Scrape into the prepared skillet and smooth the top. Sprinkle the ground butter crackers and remaining 2 tablespoons Parmesan on top.
Step 4
Bake until golden brown and bubbling, 20 to 25 minutes. Cool for 10 minutes, then sprinkle with ground cayenne, hot sauce and chives. Serve with baguette, celery sticks, carrots, additional crackers and more hot sauce.