Preheat the oven to 375°F. In a large skillet, melt the butter over medium heat. Add the white parts of the green onions, the green and red bell peppers, onion, and celery with a pinch of salt.
5 tablespoons unsalted butter, 6 whole green onions, 1 medium green bell pepper, 1 medium red bell pepper, 1 large yellow onion, 2 stalks celery, 2 - 3 teaspoons kosher salt
Sauté until the vegetables are soft and fragrant, about 5 minutes. Add the garlic, Cajun seasoning, and lemon zest. Cook, stirring constantly, until fragrant, about 30 seconds to 1 minute.
10 cloves garlic, 3-4 teaspoons Cajun seasoning, Zest of 1 lemon
Add the crawfish tail meat and season with salt and black pepper to taste. Stir to warm through.
1 pound Louisiana crawfish tail meat, ¼ - ½ teaspoon black pepper
Add the cream cheese, hot sauce, Worcestershire sauce, horseradish, and Creole mustard. Reduce heat to medium-low and stir often until the cream cheese melts.
8 ounces cream cheese, 2 tablespoons Louisiana-style hot sauce, 2 tablespoons Creole mustard, 2 teaspoons horseradish sauce, 2-3 teaspoons Worcestershire sauce
Begin adding the parmesan and white cheddar in small handfuls, stirring to melt each addition before adding more. Reserve some cheese for topping. Stir in some of the dark green parts of the green onions (save the rest for garnish).
2 cups sharp white cheddar cheese, 1½ cups parmesan cheese
Remove from heat and stir in the lemon juice. Top with the remaining cheese and crushed Ritz crackers.
Juice of ½ a lemon, 15 crushed Ritz crackers
Bake until golden brown and bubbly, 25-30 minutes.
Top with fresh parsley, green onions, and extra crawfish if desired. Serve hot with baguette slices, crackers, tortilla chips, or veggies.
Chopped parsley, green onions, more crawfish, and hot sauce for garnish